Most marathon runners should taper for about two to three weeks, cutting weekly mileage by roughly 40 to 60 per cent while keeping some running at race pace. That is the broad consensus from the research, though the details vary with experience, training load and how quickly you tend to recover.
The science is better than you might expect for a sport so full of folklore.
- Most marathon runners taper for two to three weeks.
- Training volume is typically cut by 41 to 60 per cent.
- Race-pace efforts are kept during the taper to preserve sharpness.
Why tapering works, and how long it should last
A 2007 meta-analysis by Bosquet and colleagues, published in Medicine & Science in Sports & Exercise, pooled data from dozens of studies on tapering. It concluded that a taper of around two weeks (they suggested eight to 14 days) produced the best average gains in performance, which were in the region of 2 to 3 per cent. For a four-hour marathoner, 2 to 3 per cent is somewhere between five and seven minutes. Few training tweaks offer that for doing less.
The mechanism is fairly intuitive. Weeks of heavy training leave you with accumulated muscle damage, depleted glycogen stores and a degree of hormonal and nervous system fatigue. Reducing the load allows muscle glycogen to be replenished, damaged tissue to repair, and the sense of heaviness in the legs to lift, while the fitness you built over months stays largely intact.
Fitness fades slowly. Fatigue fades fast.
That difference in speed is the whole logic of the taper. Aerobic capacity declines over weeks of inactivity, not days, so a short reduction in training costs you very little. Meanwhile the fatigue masking your fitness clears within a fortnight or so.
Practical guidance from most coaches and sports scientists therefore falls into a window of one to three weeks. Beginners and those running lower mileage often do well with around two weeks. Runners logging high weekly distances, or those who have been through a punishing final block, may benefit from the full three. Going beyond three weeks tends to risk a loss of sharpness without much additional recovery benefit, although the evidence for very long tapers is thin.
How much to cut, and what to keep
Volume is the lever that matters most. The Bosquet analysis found that reducing training volume by 41 to 60 per cent gave the best results, whereas smaller cuts did not free up enough recovery and larger ones risked detraining. If you are peaking at 50 miles a week, that points towards roughly 20 to 30 miles in race week itself.
How you get there also matters. The same research favoured a progressive taper, where load falls steadily, over a sudden drop to the target level, though the difference between the two was modest. A common pattern for a three-week plan is to run around 75 per cent of peak volume in the first week, about 50 to 60 per cent in the second and 30 to 40 per cent in the final week, which includes the race itself.
Intensity is the part people get wrong. Evidence from the taper literature indicates that maintaining intensity, while cutting volume and to a lesser extent frequency, is what preserves and even sharpens performance. Dropping everything to easy jogging may leave you feeling flat on race morning.
Keep the pace, trim the distance.
In practice that means keeping a few short efforts at goal marathon pace or slightly faster. A session such as three to four miles broken into repeats at race pace, with generous recovery, reminds your legs what the target feels like without adding meaningful fatigue. Frequency should stay close to normal, perhaps dropping by a day at most, because running regularly helps maintain rhythm and the neuromuscular patterns of your usual stride.
The long run in the final weeks
The last long run is typically done about two to three weeks before race day, and it is where many runners overreach. By the second taper week, a long run of 10 to 13 miles is enough for most people. Treat it as a rehearsal for fuelling, kit and pacing, not as a final test of fitness. Nothing you do in the last fortnight will add measurable fitness, but a hard session in week one of the taper can still leave you tired on the start line.
Dealing with taper madness, food and sleep
Many runners report feeling worse during the taper: sluggish, niggly, irritable, sometimes convinced they are coming down with something. Anecdotally this is so common that runners have a name for it, “taper tantrums” or “taper madness”. Part of it is psychological, since the sudden drop in routine and endorphin hits leaves a gap, and part may be the body shifting into repair mode, where aches that were previously masked by hard training become noticeable.
It helps to have a plan for the extra time. Sleep is an obvious candidate, and there is good evidence from sports research that extended sleep improves athletic performance, with studies of basketball players and swimmers among those often cited. Aim for consistent bedtimes in the final week, and be aware that the night two nights before the race matters at least as much as the night before, when nerves frequently interfere.
Eating needs a little thought, too. Your energy expenditure falls as mileage drops, so there is no need to eat as you did at peak training. The standard advice for marathon carbohydrate loading, supported by sports nutrition bodies, is to aim for roughly 8 to 12 grams of carbohydrate per kilogram of body weight per day for the 36 to 48 hours before the race. For a 70 kg runner that is 560 to 840 grams daily, which is far more than most people expect and can feel uncomfortable, so practise it in training and favour familiar, lower-fibre foods in the last day or two.
Resist the urge to squeeze in a “confidence run”. A hard session in the last week can add soreness without giving any fitness benefit. A few easy miles with a couple of short pickups two or three days before the race is plenty.
Individual variation is large. Studies on tapering often average out results across groups, which hides the fact that some runners respond best to a short taper and others to a longer one. If you have run several marathons, look back at which build-ups left you feeling fresh and which left you flat, and let your own record guide the choice more than any formula.
This article is general information, not personal medical or coaching advice. If you have an injury, a health condition or concerns about training load, speak to your GP or a qualified coach before changing your plan.
One last nuance: the research on tapering is mostly based on shorter events and trained athletes, so marathon-specific evidence is thinner than the confident advice in running magazines suggests.