How to Recover After a Marathon — The First 4 Weeks
You have run a marathon. The medal is on the wall, the legs are in pieces, and the question is what now. The answer is less exciting than the race and more important than the race: recovery is a four-week process, not a single day, and the runners who recover well are the ones who respect it — while the runners who rush back are the ones who get injured, ill, or both.
This guide is the first four weeks after a marathon: the reverse taper, what to eat and drink, when to walk and when to run, the signs that recovery is on track, and when it is safe to race again. It is written for the first-time marathoner who has never been this tired, and for the experienced runner who has forgotten how long recovery takes.
Use the calculator
Start with your own numbers: try our running calorie calculator, protein calculator to work out your figures before applying anything on this page. The worked examples below use round numbers so you can follow the maths; the calculators use your real weight, height, age and goal.
Related reading: Marathon Training Guide — 16-Week Plan, Pacing and Fuelling, Long Runs Explained — How Long, How Slow, How Often, Sleep and Muscle Growth — Why 7-9 Hours Is Non-Negotiable. You can also browse the full guides section for the rest of the series.
The key points
Week one is for walking, not running. The first 3–7 days after a marathon should contain no running at all — walking, gentle stretching, light cycling or swimming, and sleep. The muscle damage from 42 km takes days to repair, and running on damaged muscle does not speed the repair; it delays it. The soreness peaks at 48 hours and fades over the week, and the legs will tell you when they are ready — usually around day 5–7, when walking down stairs stops hurting.
The reverse taper rebuilds volume gradually. Week two is 20–30 minutes of easy running, two or three times; week three is 30–45 minutes, three or four times, with a little tempo if the legs feel good; week four is a near-normal easy week, with the first longer run (60–75 minutes) at the end. That is the reverse taper — the mirror image of the taper that preceded the race — and it takes the same discipline: the urge to run hard in week two is strong, and it is wrong.
Eat and drink for repair, not for the race. The first 48 hours need carbohydrate to refill glycogen (which the race emptied) and protein to repair muscle (1.6–2.0 g/kg a day is a good target for the recovery weeks). Drink to thirst, eat normally, and do not diet in the first week — the body needs energy to repair, and a calorie deficit in recovery week is how illness and injury happen. The weight gained in the first days is mostly water and glycogen returning, not fat.
Sleep is the most powerful recovery tool. The muscle damage, the hormonal disruption and the immune suppression of a marathon all repair during sleep, and the first week needs more of it — 8–9 hours a night if possible, plus naps. Short sleep in recovery week is associated with more illness and slower return to training, and no supplement or ice bath compensates for it. Protect the sleep the way you protected the long runs.
The immune system is suppressed for days after a marathon. The "open window" after very hard exercise — a period of reduced immune function lasting hours to days — is why so many marathoners catch a cold in the week after the race. The fix is boring: sleep, eat well, avoid crowded places and sick people for a few days, wash your hands, and do not train hard while the window is open. A cold in week two costs more than a rest day in week one.
The post-marathon blues are real. A low mood, irritability and a sense of emptiness in the days after a marathon are common — the goal that structured months of life is suddenly gone, and the body is exhausted. It passes, usually within a week or two, and the fix is a new goal (not necessarily a race), a return to routine, and social contact. If the low mood persists beyond a few weeks, or it is severe, talk to someone — it is not a failure, and it is not unusual.
At a glance
| Week | Running | Other activity | What to expect |
|---|---|---|---|
| Week 1 | None for 3–7 days | Walking, gentle stretching | Soreness peaks at 48 h, fades by day 7 |
| Week 2 | 2–3 × 20–30 min easy | Light cycling, swimming | Legs feel heavy; pace is slow |
| Week 3 | 3–4 × 30–45 min easy | Normal cross-training | Strength returning; first tempo if ready |
| Week 4 | Near-normal easy week | Full routine | First long run (60–75 min) at the end |
| Week 5+ | Normal training resumes | Race planning | Ready to build toward the next goal |
Do not race for at least 4–6 weeks after a marathon, and do not start another marathon build for at least 6–8 weeks. The body needs the time.
The formula behind it
The recovery maths is about energy and protein, not pace. A marathon burns roughly 2,600–3,000 kcal for a 75 kg runner (Compendium of Physical Activities, Ainsworth et al., 2011: 9.8 MET × 75 kg × 4 hours ≈ 2,940 kcal), and the glycogen stores (about 2,000 kcal) are emptied by the race — which is why the first 48 hours need carbohydrate at 1–1.2 g/kg in the recovery meals, plus normal eating. A 75 kg runner needs about 75–90 g of carbohydrate in the first recovery meal, and 450–525 g over the day if following the 6–7 g/kg guideline for heavy training days.
Protein for repair is 1.6–2.0 g/kg a day during the recovery weeks: at 75 kg that is 120–150 g a day, or 30–38 g per meal across four meals. The calorie maths comes from Mifflin-St Jeor (Mifflin et al., 1990): a 35-year-old man, 75 kg, 180 cm, lightly active in recovery week has a BMR of 750 + 1,125 − 175 + 5 = 1,705 kcal and a TDEE of about 2,344 kcal — and eating at or slightly above that, rather than dieting, is what funds the repair. The safety floors (1,200 kcal women, 1,500 kcal men) are minimums, not targets, and recovery week is the worst possible time to eat below them.
Your plan, step by step
- Do not run for 3–7 days after the marathon; walk, stretch gently, and sleep 8–9 hours a night.
- Eat carbohydrate and protein generously for the first 48 hours — do not diet in recovery week.
- In week two, run 2–3 times for 20–30 minutes, easy, and stop if the legs still hurt.
- In week three, build to 3–4 runs of 30–45 minutes; add a little tempo only if the legs feel good.
- In week four, return to a near-normal easy week, with the first longer run (60–75 min) at the end.
- Do not race for 4–6 weeks, and do not start another marathon build for 6–8 weeks.
How to use this guide
Use the four weeks as a structured return, not a void to fill. The reverse taper works because it is gradual: each week adds a little more, and the body has time to adapt at each step. Runners who jump back to full training in week two usually feel fine for a few days — and then get injured or ill in week three, when the accumulated damage catches up. The patience of week one is what makes week four possible.
Set the next goal in week two or three, once the body has recovered enough to think clearly. It does not have to be another marathon — a 10K, a faster 5K, a trail race, or simply a consistent routine are all good goals, and the right one is the one that excites you. The post-marathon blues fade fastest when there is something to look forward to, and the new goal is the bridge from the race you finished to the running you will do next.
What this guide does NOT tell you
This guide is general information, not medical advice. Recovery varies with age, fitness, the race conditions and the effort — older runners and first-time marathoners need longer, and a hot or hilly marathon needs longer than a cool, flat one. Persistent pain, swelling, pain that worsens rather than improves, chest pain, breathlessness, or feeling unwell for more than a few days after the race all need medical attention, not more rest.
The immune suppression after a marathon is real but its size is debated, and the "open window" is a simplification of a complex response — the practical advice (sleep, eat well, avoid exposure, do not train hard) is sound whatever the exact mechanism. This guide cannot judge whether your recovery is normal or whether you need care; if something feels wrong, get it checked rather than waiting for the plan to fix it.
Frequently asked questions
How long does it take to recover from a marathon?
About four weeks to return to normal training, and 4–6 weeks before racing again. The muscle damage repairs over 7–14 days, the glycogen stores refill within 48 hours with good eating, and the general fatigue fades over 2–3 weeks — but the full recovery, including the hormonal and immune effects, takes closer to a month. Older runners and first-time marathoners should allow longer, and a hot or hilly marathon needs longer than a cool, flat one.
Can I run the day after a marathon?
You can walk, but you should not run: the muscle damage from 42 km takes days to repair, and running on damaged muscle delays the repair rather than speeding it. Most coaches recommend 3–7 days with no running, then a gradual return starting with 20–30 minute easy runs in week two. The legs will tell you when they are ready — usually when walking down stairs stops hurting, around day 5–7.
Why do I feel ill after a marathon?
Very hard exercise temporarily suppresses the immune system — the "open window" lasting hours to days — which is why colds are common in the week after a marathon. The risk is higher with poor sleep, low energy intake and crowded post-race environments. The fix is sleep, good food, avoiding sick people and crowded places for a few days, and not training hard while the window is open. A cold in week two costs more than a rest day in week one.
When can I race again after a marathon?
Not for at least 4–6 weeks, and a 5K or 10K is a better first race back than another long event. The body needs the full four-week recovery before it can perform well, and racing too soon risks injury and a poor result that damages confidence. Do not start another marathon build for at least 6–8 weeks after the race — the training load of a marathon build on top of an incomplete recovery is how overuse injuries happen.
Is it normal to feel depressed after a marathon?
Yes, very common: the post-marathon blues — low mood, irritability, a sense of emptiness — affect many runners in the days after the race, because the goal that structured months of life is suddenly gone and the body is exhausted. It usually passes within a week or two. Setting a new goal, returning to routine, and talking to other runners all help. If the low mood persists beyond a few weeks or is severe, talk to a clinician — it is not a failure, and it is not unusual.
Estimates only, not medical advice. Minimum safe intakes: 1,200 kcal/day women, 1,500 kcal/day men — consult a healthcare professional before a very-low-calorie diet.