A marathon training plan for experienced runners moves from durable easy volume, to threshold support, to long runs that rehearse marathon pace and race fueling. The key sessions are the long run and the marathon-pace workout, and both need more recovery than ordinary runs. Carbohydrate intake in the race, practiced in training, is as much a part of the plan as any workout.
This guide is part of our running training plans by event series.
What does the marathon actually demand?
The marathon is a fuel, temperature, pacing and durability problem as much as a fitness test. Marathon pace sits well below threshold, so the challenge is not running fast; it is holding a moderate pace for two to four hours while carbohydrate stores fall and legs take damage.
That shapes the week. Most running stays easy, a solid middle slice sits at steady, marathon and threshold effort, and very hard interval work is a small part of the plan. Volume matters more than for any shorter race, but only volume you can hold for weeks without soreness piling up. See the 80/20 rule and how many miles a week to run.
How should long runs progress?
Build the distance first, then add specific work inside it.
- Easy long runs: conversational, building toward 2 hours 30 minutes or roughly 20 to 22 miles depending on your pace and history. See long run percentage of weekly mileage.
- Progression long runs: the last 30 to 45 minutes building from steady toward marathon effort.
- Marathon-specific long runs: blocks at marathon pace inside a long run, such as 3 x 3 miles at marathon pace with 1 mile steady, or 12 to 16 miles continuous at marathon pace late in the build.
Do not race every long run. A specific long run is a hard session, and it often needs two or three easy days after it.
What marathon-pace work should you do?
- Midweek steady runs at a little slower than marathon pace, 45 to 70 minutes, as a bridge between easy volume and specific work.
- Marathon-pace reps: 4 x 3K or 3 x 5K at marathon pace with short floats, growing toward longer continuous blocks.
- Threshold support: one session a week in the middle of the build, such as 4 x 2K or 2 x 20 minutes at threshold effort, so marathon pace sits further below your ceiling. See threshold run pace.
- Strides and hill sprints: small doses all season to keep your stride from going flat.
How much carbohydrate should you take in training and racing?
This is where marathon research has moved the most. A review of carbohydrate intake during exercise recommended up to about 60 grams per hour for efforts of two to three hours from a single carbohydrate source, and about 90 grams per hour for longer efforts, which requires a mix of carbohydrate types that the gut absorbs through different routes. The same review noted that this advice does not depend on body weight.
What runners actually eat often falls short. In a study of endurance competitions, marathoners reported an average of about 35 grams of carbohydrate per hour, far lower than triathletes, and intake varied enormously between athletes. A nutrition review for distance runners described beneficial in-race intakes rising to 75 to 90 grams per hour in the longest races, and stressed that the plan should be personalized and practiced.
The answer is to build intake gradually in training, so race day holds no surprises. In practice:
- Start where you are. If you take 30 grams per hour now, practice 40 to 50 in long runs before trying more.
- Rehearse in specific long runs with the exact gels, drink and caffeine you will use on race day.
- Use mixed carbohydrate sources if you aim above 60 grams per hour.
- Carb loading can be simple: a higher-carbohydrate diet for the last 1 to 2 days, no depletion phase.
- Drink to thirst and do not overdrink. See when runners need fuel.
What does a sample week look like in each phase?
Paces come from current fitness: easy, steady, marathon, threshold. Set marathon pace from a recent half or 10 miles, not from a goal you have not run.
Base (about 6 to 8 weeks)
- Mon: easy or off.
- Tue: easy, strides.
- Wed: steady run, 45 to 60 minutes.
- Thu: easy, strength.
- Fri: easy plus hill sprints.
- Sat: easy.
- Sun: easy long run, building gradually.
Threshold support (about 4 to 6 weeks)
- Tue: threshold or sub-threshold reps.
- Fri: steady or marathon-pace reps.
- Sun: long run with a progression finish.
Marathon-specific (about 6 to 8 weeks)
- Tue: shorter threshold session for maintenance.
- Thu or Fri: easy or a short steady run.
- Sun: marathon-specific long run every second week, alternating with an easy long run. Practice race fueling every time.
- Easy days genuinely easy; a down week every 3 to 4 weeks.
How should you taper for a marathon?
About two to three weeks, front-loaded. A meta-analysis of tapering found the best results when volume fell by roughly 40 to 60 percent over about two weeks while intensity and frequency held. Make the biggest cut early, keep your running days, and keep short marathon-pace segments. Race week adds no fitness; its job is to arrive rested.
How should you pace a marathon?
Even effort. A study of nearly 92,000 marathon performances found that runners slowed by an average of 15.6 percent (men) and 11.7 percent (women) in the second half, and that more experienced runners slowed less. Run the first half at goal pace or slightly slower, take your fuel on schedule from early in the race, and do not chase time lost on hills or in a crowded start. If the day is hot, adjust the goal before the start, not at 20 miles.
How your HealthAI coach applies this
Your coach sets marathon-pace and long-run targets from your current fitness and adjusts them from the runs you log in the health portal. Every session over 75 minutes in your 2-week plan carries a fueling note, so you practice race intake in training. When your check-ins show poor sleep, soreness or low energy after a big long run, it adds recovery before the next key day. Plans start at $30 a month; see plans.
Your coach builds this around your training data. Start at HealthAI.coach.
Sources
- Jeukendrup A, A step towards personalized sports nutrition: carbohydrate intake during exercise. Sports Medicine, 2014. doi:10.1007/s40279-014-0148-z
- Pfeiffer B et al., Nutritional intake and gastrointestinal problems during competitive endurance events. Medicine and Science in Sports and Exercise, 2012. doi:10.1249/MSS.0b013e31822dc809
- Burke LM et al., Contemporary Nutrition Strategies to Optimize Performance in Distance Runners and Race Walkers. International Journal of Sport Nutrition and Exercise Metabolism, 2019. doi:10.1123/ijsnem.2019-0004
- Bosquet L et al., Effects of tapering on performance: a meta-analysis. Medicine and Science in Sports and Exercise, 2007. doi:10.1249/mss.0b013e31806010e0
- Deaner RO et al., Men are more likely than women to slow in the marathon. Medicine and Science in Sports and Exercise, 2015. doi:10.1249/MSS.0000000000000432