Marathon Taper: How Much to Cut in the Final Weeks (and What to Keep)

Sixteen or eighteen weeks of marathon training end with two or three weeks in which you run less. That phase, the taper, is the one runners question most and botch most often: they cut too much, cut too little, or cut the wrong thing. Among more than 158,000 recreational marathoners analyzed by Smyth and Lawlor (2021), those who followed a disciplined three-week taper finished a median 5 min 32 s faster (2.6%) than those on a minimal taper. Most runners (64%) were in the relaxed-taper group.

This guide collects what the research says about duration, how much to cut and what to protect. It shows how five marathon plans in the catalog handle those weeks and ends with a three-week table you can adapt to your own marathon training plan.

Key takeaways

• Duration: 2 to 3 weeks. Bosquet's 2007 meta-analysis points to 2 weeks as the sweet spot; data on recreational marathoners favors up to 3, with nothing gained from a fourth.
• Volume: a progressive 41 to 60% reduction by race week, taken out of easy runs and the long run.
• Intensity and frequency: kept. Quality sessions get shorter, not slower; running days stay almost the same.
• Expected gain: roughly 3% (range 0.5 to 6%), about 6 minutes at a 3:30 marathon.
• Nothing new in the last week. If the scale goes up, that is glycogen plus water, not fat.

Why tapering works

Tapering is, in the definition of Mujika and Padilla (2003), a progressive, nonlinear reduction of the training load to minimize accumulated fatigue without compromising adaptations. Their summary formula: maintain intensity, reduce volume (in some sports by as much as 60 to 90%), and trim frequency only slightly, by no more than 20%. Performance usually improves by about 3%, with a usual range of 0.5 to 6%.

That gain does not come from getting fitter in the last two weeks. It comes from uncovering fitness that fatigue was hiding. The review by Mujika, Padilla, Pyne and Busso (2004) lists what changes in the body. Muscle glycogen rises progressively, blood and red cell volume increase, strength and power improve markedly, and markers of muscle damage fall. Athletes report less mood disturbance, lower perceived effort, and better sleep.

Complete rest does not produce the same effect. In the experiment by Shepley and colleagues (1992), nine trained middle-distance runners each completed three 7-day tapers: high intensity with low volume, low intensity with moderate volume, and rest only. Time to exhaustion at 1,500 m pace rose 22% after the high-intensity taper and 6% after the low-intensity one. After rest alone it fell 3%, and blood volume dropped. A taper means training less, not stopping.

How long: two weeks or three?

The meta-analysis by Bosquet, Montpetit, Arvisais and Mujika (2007), covering 27 studies of competitive athletes across several sports, found the largest effect for 2-week tapers. Marathon-specific data points a little further out. In Smyth and Lawlor (2021), tapers of up to 3 weeks were associated with better finish times than shorter ones, and a fourth week added nothing. Among elite British marathoners, the median taper lasted 14 days, versus 6 days for runners racing 3,000 m to 10,000 m (Spilsbury and colleagues, 2015).

Two criteria help you pick within that range:

• Accumulated load. Above 50 miles (80 km) a week, or with signs of fatigue at the end of the cycle (poor sleep, elevated resting heart rate, quality sessions that fall flat), the full 3 weeks pay off. Under 30 miles (50 km), or on a high-frequency plan like Hansons, 10 to 14 days usually does the job.
• Discipline. In Smyth and Lawlor's data, "strict" means every week has fewer miles than the one before, in unbroken sequence up to race day. A relaxed taper (one week down, one up, one down) lost to a strict one at every duration. The drops do not have to get steeper each week; they just cannot step back up.

The authors note that the study is observational: runners who tapered better may also have trained better. The direction, though, matches the controlled studies in trained athletes.

How much volume to cut (and where from)

Bosquet and colleagues found the largest effect with a 41 to 60% volume reduction applied exponentially (progressive cuts) rather than as a single step. For the marathon, that range is the practical reference: Spilsbury's elite marathoners cut continuous running to 53% of normal and interval volume to 64%.

The cut comes out of easy runs and the long run, not out of training days. A pattern that respects the research: 20 to 25% less three weeks out, 40% less two weeks out, 55 to 60% less in race week, counting through Saturday.

What five catalog plans do in the final three weeks

To see how the well-known methods apply this, we calculated the weekly volume of five marathon plans in the Magic Training catalog with the same engine the plan page uses, counting race week through the day before the race. The figures are percentages of each plan's peak week.

The methods disagree about when to start descending and agree about where to land: all of them finish race week between 22 and 43% of peak. Pfitzinger comes down early, in gentle steps. Daniels cuts deepest in the final week. Hansons holds 85% until ten days out and then cuts in half, with the last hard workout exactly ten days before the race and runs on five of the six final days. Luke Humphrey, co-author of the method, puts the Hansons taper at 10 to 14 days. His rule: "smaller percentages in mileage and workout frequency, but maintain your daily intensity." The biggest mistake he sees is "cutting way too much from their training during the taper," which leaves you "sluggish like you got too much sleep" (Humphrey, 2019).

What to keep: intensity and frequency

In Bosquet's meta-analysis, the best results came from tapers that changed neither intensity nor frequency. In Houmard and colleagues (1994), trained runners cut 85% of their volume for 7 days and kept high-intensity intervals: they ran 3% faster over 5 km and improved running economy by 6%. Runners who did the same taper on a bike merely maintained performance. Among Spilsbury's elite marathoners, peak interval intensity during the taper was 114% of race speed.

In practice, for the marathon:

• Quality sessions continue, shorter. If the standard session was 6 x 1 km, run 3 or 4 x 1 km at the same pace. If it was 6 miles (10 km) at marathon pace inside the long run, run 3 to 4 miles (5 to 6 km). Interval training loses repetitions, not speed.
• Race pace is the ingredient that stays. A short marathon-pace block on Tuesday or Wednesday of race week keeps the feel of the pace and your economy at that speed. Confirm the number with an updated pace prediction, not with hopes pinned on a rested week.
• Running days stay almost the same. If you run six days a week, run five or six, with shorter sessions. Mujika and Padilla recommend cutting frequency by no more than 20%: one day out of six, not three.
• Strides replace volume. Four to six 15- to 20-second accelerations after an easy run keep cadence and power without adding fatigue.
• Strength work tapers too. Last heavy lifting session at least ten days out; in the final week, mobility and light activation only. That is coaching practice, not a controlled finding.

Sample 3-week taper

The table applies the research range to two common peaks. Race week counts six days, Monday through Saturday, with the marathon on Sunday. Keep the long run in your usual training zones: the pace does not change, only the distance.

If your plan is Hansons-style, with six running days and high volume to the end, swap the first two rows for 85% and keep the third: the landing point is the same.

The most common mistakes

Cutting intensity along with volume

The most expensive mistake, and the most intuitive: "I'm resting, so I'll run everything slow." The low-intensity taper in Shepley's study delivered a third of the gain of the intense one, and complete rest went negative. Two weeks of nothing but jogging take your body out of the rhythm it needs to recognize at mile 19.

Trying something new

Shoes, gels, a belt, a strength exercise, a deep-tissue massage. The last week leaves no time to react if something goes wrong. Everything that goes to the race must have been through a long run first, including your fueling and hydration strategy.

The panic workout

Ten days out, the feeling of "I'm losing fitness" pushes many runners to wedge a 20-mile long run or a time trial into the taper. In Smyth and Lawlor's data, that turns a strict taper into a relaxed one, exactly the pattern associated with slower finishes. Race fitness was built in the previous 15 weeks; no session in the last 10 days adds to it, and several can take from it.

The scale and carbohydrates

Seeing the scale go up in the last two weeks is common. Part of it is glycogen: muscle stores each gram of glycogen with at least 3 g of water (Fernández-Elías and colleagues, 2015). That weight is the fuel you want to carry to the start line. Restricting carbohydrate to "compensate" for less training sabotages the race. Daily energy expenditure drops during the taper (Mujika and colleagues, 2004), so appetite tends to adjust on its own; the carb load of the final two or three days deserves an article of its own.

Treating the taper as vacation

Late nights, skipped running days, a changed routine for meals and sleep. Preserved frequency is one of the components that make the taper work, and routine is what preserves it. Humphrey's version: keep your routine while gradually cutting the work back.

Race week, day by day

With the marathon on Sunday, a week that honors the three rules (less volume, intensity present, frequency kept):

• Monday: 30 to 40 min easy, or a rest day if your plan had one.
• Tuesday: warm-up, 3 x 1 km at marathon pace with 2 min jog recovery, cool-down. 5 to 6 miles (8 to 10 km) total.
• Wednesday: 30 to 40 min easy.
• Thursday: 25 to 30 min easy with 4 to 6 strides of 15 to 20 seconds.
• Friday: rest, or 20 min very easy if a day off makes you restless.
• Saturday: 15 to 20 min jog with 2 or 3 short pickups. Feet up the rest of the day: the expo is not the place to spend three hours standing.
• Sunday: race. In the first 3 miles, goal pace will feel too easy. That is the taper working; do not spend it before mile 19.

Two nights before the race is the sleep that matters; the night before is poor for almost everyone. Load the race workout onto your watch with pace alerts set, confirm it synced, and change nothing else.

What about the half marathon?

The half demands less recovery and therefore a smaller taper: 7 to 14 days is usually enough. Bosquet's 2-week reference applies well, and the elite runners racing up to 10,000 m in Spilsbury's survey tapered for only 6 days. A scheme that works for anyone on a half marathon training plan: last long run of 10 to 11 miles (16 to 18 km) ten days out, volume 30% lower in the penultimate week and 50% lower in race week. In the final week, one short threshold session (e.g., 3 x 2 km) on Tuesday or Wednesday and at least one block at race pace.

Frequently asked questions

Will I lose fitness running less for three weeks?

No, as long as intensity stays in. The losses described in the detraining literature, such as drops in maximal oxygen uptake and blood volume, happen when the stimulus becomes insufficient, typically with training cessation (Mujika and Padilla, 2000). A taper keeps the stimulus and removes the fatigue; that is why the average effect across studies is positive.

Can I race a shorter event during the taper?

A 5K or 10K two to three weeks before the marathon can replace that week's quality session and helps calibrate pace. Not in race week: the recovery cost is not worth it.

What if I feel odd aches during the taper?

Common: with less fatigue, the body "hears" small complaints that heavy training was masking. Pain that does not worsen while running and does not change your stride is usually no reason to alter the plan. Pain that changes your stride deserves assessment before the race.

After the finish line, the work changes name: post-race recovery. A well-executed taper tends to shorten that phase too.

References

• Bosquet L, Montpetit J, Arvisais D, Mujika I. Effects of tapering on performance: a meta-analysis. Medicine & Science in Sports & Exercise, 2007;39(8):1358-65. PubMed 17762369
• Mujika I, Padilla S. Scientific bases for precompetition tapering strategies. Medicine & Science in Sports & Exercise, 2003;35(7):1182-7. PubMed 12840640
• Mujika I, Padilla S, Pyne D, Busso T. Physiological changes associated with the pre-event taper in athletes. Sports Medicine, 2004;34(13):891-927. PubMed 15487904
• Mujika I, Padilla S. Detraining: loss of training-induced physiological and performance adaptations. Part I: short term insufficient training stimulus. Sports Medicine, 2000;30(2):79-87. PubMed 10966148
• Smyth B, Lawlor A. Longer disciplined tapers improve marathon performance for recreational runners. Frontiers in Sports and Active Living, 2021;3:735220. PMC8506252
• Spilsbury KL, Fudge BW, Ingham SA, Faulkner SH, Nimmo MA. Tapering strategies in elite British endurance runners. European Journal of Sport Science, 2015;15(5):367-73. PubMed 25189116
• Houmard JA, Scott BK, Justice CL, Chenier TC. The effects of taper on performance in distance runners. Medicine & Science in Sports & Exercise, 1994;26(5):624-31. PubMed 8007812
• Shepley B, MacDougall JD, Cipriano N, Sutton JR, Tarnopolsky MA, Coates G. Physiological effects of tapering in highly trained athletes. Journal of Applied Physiology, 1992;72(2):706-11. PubMed 1559951
• Fernández-Elías VE, Ortega JF, Nelson RK, Mora-Rodriguez R. Relationship between muscle water and glycogen recovery after prolonged exercise in the heat in humans. European Journal of Applied Physiology, 2015;115(9):1919-26. PubMed 25911631
• Humphrey L. First Marathon Series Part 6: The Taper. Luke Humphrey Running, Feb 26, 2019. lukehumphreyrunning.com
• Catalog plan volumes calculated on Oct 19, 2026 with the same volume engine as each plan page, race week counted through the day before the race.