{"id":18371,"date":"2026-04-04T13:58:14","date_gmt":"2026-04-04T12:58:14","guid":{"rendered":"https:\/\/blog.fourthfrontier.com\/uk\/?p=18371"},"modified":"2026-04-09T14:00:32","modified_gmt":"2026-04-09T13:00:32","slug":"vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance","status":"publish","type":"post","link":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/","title":{"rendered":"VO\u2082 Max Training for Marathon Runners: How to Increase Speed Without Losing Endurance"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Marathon runners spend most of their training building endurance, but speed still matters. The ability to run faster at the same effort often comes down to one key factor: VO\u2082 max.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Improving VO\u2082 max can make marathon pace feel easier, help you handle hills more comfortably, and allow you to finish strong instead of slowing down late in the race.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The challenge is that many runners try to increase speed by adding more hard workouts, and in the process, they lose the endurance they worked so long to build. The goal of VO\u2082 max training for marathon runners is not just to get faster, but to get faster without sacrificing aerobic durability.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When done correctly, VO\u2082 max work adds power to your engine while Zone 2 and threshold training keep that engine efficient.<\/span><\/p>\n<h2><b>What VO\u2082 Max Means for Marathon Runners<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">VO\u2082 max refers to the maximum amount of oxygen your body can use during intense exercise. In simple terms, it reflects how strong your cardiovascular system is when effort is high.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For marathon runners, a higher VO\u2082 max usually means:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Faster sustainable pace<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Better ability to handle surges<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Less fatigue at race pace<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Stronger finishing miles<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Even though the marathon is mostly aerobic, VO\u2082 max still matters because it sets the ceiling for performance. The higher the ceiling, the easier it is to run at a steady pace below it.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Think of it this way:<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">If your top speed improves, your marathon pace takes up a smaller percentage of your maximum effort.<\/span><\/p>\n<h2><b>Why Marathon Runners Still Need Speed Work<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Some runners avoid high-intensity training because they are afraid of losing endurance. Others do too much speed work and end up tired all the time.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Both mistakes come from misunderstanding how VO\u2082 max training should fit into a marathon plan.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Proper VO\u2082 max sessions help you:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use oxygen more efficiently<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Increase stroke volume of the heart<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Improve running economy<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tolerate faster paces with less strain<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">These changes make marathon pace feel more controlled, not more stressful.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The key is balance. VO\u2082 max training should support endurance, not replace it.<\/span><\/p>\n<h2><b>Where VO\u2082 Max Fits in the Training Zone System<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Heart-rate\u2013based training divides effort into zones. VO\u2082 max work usually happens near the top end of the scale.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Typical structure:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zone 1 \u2013 Recovery<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zone 2 \u2013 Aerobic base<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zone 3 \u2013 Steady\/moderate<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zone 4 \u2013 Threshold (near VT2)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zone 5 \u2013 VO\u2082 max \/ high intensity<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Zone 5 sessions are short but demanding. They push the heart and lungs close to their limit, which signals the body to adapt.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Because this intensity is high, these workouts should be done carefully and not too often.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For marathon runners, most training should still be in Zone 2, with smaller amounts of threshold and VO\u2082 max work.<\/span><\/p>\n<h2><b>How VO\u2082 Max Training Improves Marathon Performance<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">It may seem strange that short, fast intervals can help with a 26.2-mile race, but the connection is clear when you look at what changes inside the body.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">VO\u2082 max training helps:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Increase the amount of oxygen delivered to muscles<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Improve how muscles use that oxygen<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Strengthen the heart\u2019s pumping ability<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Raise the speed you can hold before fatigue builds quickly<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">When these adaptations happen, marathon pace requires less effort. Your heart rate stays lower, breathing stays more controlled, and the chance of fading late in the race decreases.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This is why runners who include controlled VO\u2082 max work often notice that long runs start to feel smoother.<\/span><\/p>\n<h2><b>The Risk of Doing Too Much High-Intensity Training<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The biggest mistake marathon runners make with VO\u2082 max training is doing too much of it.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">High-intensity workouts create strong adaptation, but they also create more fatigue. If they replace aerobic running instead of supporting it, endurance can suffer.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Common signs of too much intensity include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Easy runs feeling harder than usual<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heart rate staying high at slow pace<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Long runs becoming inconsistent<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Trouble recovering between workouts<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Marathon training works best when high-intensity sessions are balanced with enough low-intensity volume.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Speed builds the top end.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Zone 2 builds the base.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Both are needed.<\/span><\/p>\n<h2><b>Why Accurate Heart Rate Tracking Matters During VO\u2082 Max Work<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">VO\u2082 max intervals happen in a narrow effort range. If intensity is too low, the workout does not create the intended stimulus. If it is too high, fatigue increases without extra benefit.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Because of this, reliable heart-rate data becomes important.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">During fast intervals, heart rate can change quickly. Wrist-based sensors sometimes:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Lag behind effort<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Smooth sudden spikes<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Underestimate peak heart rate<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Show inconsistent readings during arm movement<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This makes it harder to know whether you are actually training in the intended zone.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chest-based monitoring captures the electrical signal of the heartbeat directly, which usually results in faster and more stable readings during high-intensity work.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Devices like <\/span><a href=\"https:\/\/fourthfrontier.com\/products\/frontier-x?geo=false\"><span style=\"font-weight: 400;\">Frontier X2<\/span><\/a><span style=\"font-weight: 400;\">, a chest-worn ECG-based monitor designed for athletes, allow runners to see how their heart responds during intervals, hills, and tempo sessions. With more consistent data, it becomes easier to keep hard workouts controlled while making sure easy runs stay easy.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For marathon runners following structured plans, this kind of accuracy helps prevent doing too much intensity without realizing it.<\/span><\/p>\n<h2><b>How to Add VO\u2082 Max Training Without Losing Endurance<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The safest way to include VO\u2082 max work is to keep it limited and consistent.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Typical guidelines for marathon runners:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">One VO\u2082 max session per week<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">One threshold session per week<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Most other runs in Zone 2<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Long run kept mostly aerobic<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Examples of VO\u2082 max workouts:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">5 \u00d7 3 minutes hard with easy recovery<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">6 \u00d7 800 meters at strong effort<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Short hill repeats with full recovery<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">These workouts should feel challenging but controlled. You should finish tired, not exhausted.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When balanced correctly, VO\u2082 max work makes you faster without making long runs harder.<\/span><\/p>\n<h2><b>VO\u2082 Max, VT2, and Marathon Pace<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">VO\u2082 max is not the same as threshold, but the two are connected.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">VO\u2082 max sets your maximum capacity<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">VT2 (threshold) determines how fast you can go for a long time<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zone 2 builds the base that supports both<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">If VO\u2082 max improves, threshold usually improves.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">If threshold improves, marathon pace feels easier.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This is why marathon plans often include small amounts of fast running even though the race itself is much slower.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The goal is not to run the marathon at VO\u2082 max.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">The goal is to make marathon pace feel far below it.<\/span><\/p>\n<h2><b>Why Long Runs Should Still Feel Easy<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">After adding speed work, some runners start pushing long runs too hard. This can cancel the benefits of VO\u2082 max training.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Long runs should usually stay in Zone 2 because they:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Build endurance<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Improve fuel efficiency<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Strengthen the heart at lower effort<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Prepare the body for late-race fatigue<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">If long runs become moderate or hard every week, recovery suffers, and the quality of faster workouts drops.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Keeping easy days easy allows hard days to work.<\/span><\/p>\n<h2><b>Signs Your VO\u2082 Max Training Is Working<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">When speed work is balanced correctly, you may notice:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Lower heart rate at the same pace<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Faster pace at the same heart rate<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Less fatigue during long runs<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Better control during tempo workouts<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Stronger finish in races<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">These changes usually appear gradually over weeks, not days.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Consistency matters more than intensity.<\/span><\/p>\n<h2><b>When Accuracy Becomes Important for Advanced Training<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Not every runner needs perfect data, but precision becomes more valuable when you:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Follow structured marathon plans<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Train using heart-rate zones<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Monitor threshold and VO\u2082 max sessions<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Track long-run effort<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Prepare for a goal race<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In these situations, small errors in heart-rate readings can change the effort of a workout without you realizing it.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Reliable measurements help keep training balanced.<\/span><\/p>\n<h2><b>Final Takeaway<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">VO\u2082 max training allows marathon runners to become faster, but speed alone is not enough. The primary goal is to improve performance without sacrificing the endurance that makes the marathon possible.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Short, controlled high-intensity sessions raise your ceiling. Zone 2 running builds the base that supports it. Threshold work connects the two.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When these pieces are balanced, marathon pace feels more comfortable, long runs feel steadier, and late-race fatigue is easier to manage.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Improvement does not come from running hard all the time. It comes from applying the right effort at the right intensity, week after week.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">And when speed and endurance grow together, the result is not just a faster runner, but a stronger one over every mile of 26.2.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Marathon runners spend most of their training building endurance, but speed still matters. The ability to run faster at the same effort often comes down to one key factor: VO\u2082 max. Improving VO\u2082 max can make marathon pace feel easier, [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":18373,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[195,196,367],"tags":[737,651,694,736,252,739,543,735,738,734],"class_list":["post-18371","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-heart-health","category-heart-rate","category-vo2-max","tag-aerobic","tag-endurance","tag-heartrate","tag-intervals","tag-marathon","tag-performance","tag-running","tag-speedtraining","tag-threshold","tag-vomax"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v19.6 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>VO\u2082 Max Training for Marathon Speed<\/title>\n<meta name=\"description\" content=\"Learn how VO\u2082 max training helps marathon runners build speed without losing endurance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.fourthfrontier.com\/uk\/vo\u2082-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VO\u2082 Max Training for Marathon Runners: How to Increase Speed Without Losing Endurance\" \/>\n<meta property=\"og:description\" content=\"Learn how VO\u2082 max training helps marathon runners build speed without losing endurance.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.fourthfrontier.com\/uk\/vo\u2082-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/\" \/>\n<meta property=\"og:site_name\" content=\"Heart Health Guides | Research Blogs on Heart Diseases | UK Fourth Frontier Blogs\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/fourthfrontier\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-04T12:58:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-09T13:00:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.fourthfrontier.com\/uk\/wp-content\/uploads\/2026\/04\/VO2-max-training.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"847\" \/>\n\t<meta property=\"og:image:height\" content=\"476\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Fourth Frontier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@FourthFrontier\" \/>\n<meta name=\"twitter:site\" content=\"@FourthFrontier\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fourth Frontier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/\"},\"author\":{\"name\":\"Fourth Frontier\",\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/#\\\/schema\\\/person\\\/6501b2680c8acdd1ed1ab4123409ff18\"},\"headline\":\"VO\u2082 Max Training for Marathon Runners: How to Increase Speed Without Losing Endurance\",\"datePublished\":\"2026-04-04T12:58:14+00:00\",\"dateModified\":\"2026-04-09T13:00:32+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/\"},\"wordCount\":1381,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/VO2-max-training.jpg\",\"keywords\":[\"Aerobic\",\"Endurance\",\"HeartRate\",\"Intervals\",\"marathon\",\"Performance\",\"Running\",\"SpeedTraining\",\"Threshold\",\"VO\u2082Max\"],\"articleSection\":[\"Heart Health\",\"Heart Rate\",\"VO2 Max\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/\",\"url\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/\",\"name\":\"VO\u2082 Max Training for Marathon Speed\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/VO2-max-training.jpg\",\"datePublished\":\"2026-04-04T12:58:14+00:00\",\"dateModified\":\"2026-04-09T13:00:32+00:00\",\"description\":\"Learn how VO\u2082 max training helps marathon runners build speed without losing endurance.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/#primaryimage\",\"url\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/VO2-max-training.jpg\",\"contentUrl\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/VO2-max-training.jpg\",\"width\":847,\"height\":476},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Heart Health\",\"item\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/category\\\/heart-health\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"VO\u2082 Max Training for Marathon Runners: How to Increase Speed Without Losing Endurance\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/#website\",\"url\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/\",\"name\":\"Heart Health Guides | Research Blogs on Heart Diseases | UK Fourth Frontier Blogs\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-GB\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/#organization\",\"name\":\"Heart Health Guides | Research Blogs on Heart Diseases | UK Fourth Frontier Blogs\",\"url\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/i0.wp.com\\\/blog.fourthfrontier.com\\\/uk\\\/wp-content\\\/uploads\\\/2022\\\/11\\\/logo_png_360x.png?fit=360%2C37&ssl=1\",\"contentUrl\":\"https:\\\/\\\/i0.wp.com\\\/blog.fourthfrontier.com\\\/uk\\\/wp-content\\\/uploads\\\/2022\\\/11\\\/logo_png_360x.png?fit=360%2C37&ssl=1\",\"width\":360,\"height\":37,\"caption\":\"Heart Health Guides | Research Blogs on Heart Diseases | UK Fourth Frontier Blogs\"},\"image\":{\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/fourthfrontier\\\/\",\"https:\\\/\\\/x.com\\\/FourthFrontier\",\"https:\\\/\\\/in.linkedin.com\\\/company\\\/fourth-frontier\",\"https:\\\/\\\/www.instagram.com\\\/fourth_frontier\\\/\",\"https:\\\/\\\/www.youtube.com\\\/channel\\\/UCzM-g0oXEoZF15fTMjzVZ4g\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/#\\\/schema\\\/person\\\/6501b2680c8acdd1ed1ab4123409ff18\",\"name\":\"Fourth Frontier\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/e23c8dc29fe236745e1a838344eb020750d1d2609c89961d54583d89988f29d4?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/e23c8dc29fe236745e1a838344eb020750d1d2609c89961d54583d89988f29d4?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/e23c8dc29fe236745e1a838344eb020750d1d2609c89961d54583d89988f29d4?s=96&d=mm&r=g\",\"caption\":\"Fourth Frontier\"},\"url\":\"https:\\\/\\\/blog.fourthfrontier.com\\\/uk\\\/author\\\/fourthfrontier\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"VO\u2082 Max Training for Marathon Speed","description":"Learn how VO\u2082 max training helps marathon runners build speed without losing endurance.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blog.fourthfrontier.com\/uk\/vo\u2082-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/","og_locale":"en_GB","og_type":"article","og_title":"VO\u2082 Max Training for Marathon Runners: How to Increase Speed Without Losing Endurance","og_description":"Learn how VO\u2082 max training helps marathon runners build speed without losing endurance.","og_url":"https:\/\/blog.fourthfrontier.com\/uk\/vo\u2082-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/","og_site_name":"Heart Health Guides | Research Blogs on Heart Diseases | UK Fourth Frontier Blogs","article_publisher":"https:\/\/www.facebook.com\/fourthfrontier\/","article_published_time":"2026-04-04T12:58:14+00:00","article_modified_time":"2026-04-09T13:00:32+00:00","og_image":[{"width":847,"height":476,"url":"https:\/\/blog.fourthfrontier.com\/uk\/wp-content\/uploads\/2026\/04\/VO2-max-training.jpg","type":"image\/jpeg"}],"author":"Fourth Frontier","twitter_card":"summary_large_image","twitter_creator":"@FourthFrontier","twitter_site":"@FourthFrontier","twitter_misc":{"Written by":"Fourth Frontier","Estimated reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/#article","isPartOf":{"@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/"},"author":{"name":"Fourth Frontier","@id":"https:\/\/blog.fourthfrontier.com\/#\/schema\/person\/6501b2680c8acdd1ed1ab4123409ff18"},"headline":"VO\u2082 Max Training for Marathon Runners: How to Increase Speed Without Losing Endurance","datePublished":"2026-04-04T12:58:14+00:00","dateModified":"2026-04-09T13:00:32+00:00","mainEntityOfPage":{"@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/"},"wordCount":1381,"commentCount":0,"publisher":{"@id":"https:\/\/blog.fourthfrontier.com\/#organization"},"image":{"@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/#primaryimage"},"thumbnailUrl":"https:\/\/blog.fourthfrontier.com\/uk\/wp-content\/uploads\/2026\/04\/VO2-max-training.jpg","keywords":["Aerobic","Endurance","HeartRate","Intervals","marathon","Performance","Running","SpeedTraining","Threshold","VO\u2082Max"],"articleSection":["Heart Health","Heart Rate","VO2 Max"],"inLanguage":"en-GB","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/","url":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/","name":"VO\u2082 Max Training for Marathon Speed","isPartOf":{"@id":"https:\/\/blog.fourthfrontier.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/#primaryimage"},"image":{"@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/#primaryimage"},"thumbnailUrl":"https:\/\/blog.fourthfrontier.com\/uk\/wp-content\/uploads\/2026\/04\/VO2-max-training.jpg","datePublished":"2026-04-04T12:58:14+00:00","dateModified":"2026-04-09T13:00:32+00:00","description":"Learn how VO\u2082 max training helps marathon runners build speed without losing endurance.","breadcrumb":{"@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/"]}]},{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/#primaryimage","url":"https:\/\/blog.fourthfrontier.com\/uk\/wp-content\/uploads\/2026\/04\/VO2-max-training.jpg","contentUrl":"https:\/\/blog.fourthfrontier.com\/uk\/wp-content\/uploads\/2026\/04\/VO2-max-training.jpg","width":847,"height":476},{"@type":"BreadcrumbList","@id":"https:\/\/blog.fourthfrontier.com\/uk\/vo%e2%82%82-max-training-for-marathon-runners-how-to-increase-speed-without-losing-endurance\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/blog.fourthfrontier.com\/uk\/"},{"@type":"ListItem","position":2,"name":"Heart Health","item":"https:\/\/blog.fourthfrontier.com\/uk\/category\/heart-health\/"},{"@type":"ListItem","position":3,"name":"VO\u2082 Max Training for Marathon Runners: How to Increase Speed Without Losing Endurance"}]},{"@type":"WebSite","@id":"https:\/\/blog.fourthfrontier.com\/#website","url":"https:\/\/blog.fourthfrontier.com\/","name":"Heart Health Guides | Research Blogs on Heart Diseases | UK Fourth Frontier Blogs","description":"","publisher":{"@id":"https:\/\/blog.fourthfrontier.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/blog.fourthfrontier.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-GB"},{"@type":"Organization","@id":"https:\/\/blog.fourthfrontier.com\/#organization","name":"Heart Health Guides | Research Blogs on Heart Diseases | UK Fourth Frontier Blogs","url":"https:\/\/blog.fourthfrontier.com\/","logo":{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/blog.fourthfrontier.com\/#\/schema\/logo\/image\/","url":"https:\/\/i0.wp.com\/blog.fourthfrontier.com\/uk\/wp-content\/uploads\/2022\/11\/logo_png_360x.png?fit=360%2C37&ssl=1","contentUrl":"https:\/\/i0.wp.com\/blog.fourthfrontier.com\/uk\/wp-content\/uploads\/2022\/11\/logo_png_360x.png?fit=360%2C37&ssl=1","width":360,"height":37,"caption":"Heart Health Guides | Research Blogs on Heart Diseases | UK Fourth Frontier Blogs"},"image":{"@id":"https:\/\/blog.fourthfrontier.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/fourthfrontier\/","https:\/\/x.com\/FourthFrontier","https:\/\/in.linkedin.com\/company\/fourth-frontier","https:\/\/www.instagram.com\/fourth_frontier\/","https:\/\/www.youtube.com\/channel\/UCzM-g0oXEoZF15fTMjzVZ4g"]},{"@type":"Person","@id":"https:\/\/blog.fourthfrontier.com\/#\/schema\/person\/6501b2680c8acdd1ed1ab4123409ff18","name":"Fourth Frontier","image":{"@type":"ImageObject","inLanguage":"en-GB","@id":"https:\/\/secure.gravatar.com\/avatar\/e23c8dc29fe236745e1a838344eb020750d1d2609c89961d54583d89988f29d4?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/e23c8dc29fe236745e1a838344eb020750d1d2609c89961d54583d89988f29d4?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/e23c8dc29fe236745e1a838344eb020750d1d2609c89961d54583d89988f29d4?s=96&d=mm&r=g","caption":"Fourth Frontier"},"url":"https:\/\/blog.fourthfrontier.com\/uk\/author\/fourthfrontier\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/posts\/18371","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/comments?post=18371"}],"version-history":[{"count":1,"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/posts\/18371\/revisions"}],"predecessor-version":[{"id":18374,"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/posts\/18371\/revisions\/18374"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/media\/18373"}],"wp:attachment":[{"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/media?parent=18371"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/categories?post=18371"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.fourthfrontier.com\/uk\/wp-json\/wp\/v2\/tags?post=18371"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}