TL;DR
- Most runners can jog easy again within 1 to 3 days, but full recovery can take 7 to 14 days depending on effort and training age.
- The best recovery plan is boring: sleep, easy movement, hydration, and a gradual return.
- Use HRV and resting heart rate as guardrails:
- HRV trending back toward baseline and resting heart rate normalizing usually means you are recovering.
- HRV suppressed and resting heart rate elevated for several days means you should not force intensity.
- Soreness is not the only factor. Your nervous system and sleep can be stressed even when your legs feel fine.
Why a half marathon can hit harder than you expect
A half marathon is "only" 21.1 km, but many people race it close to their limit.
That creates a mix of stress:
- muscle damage (especially quads from downhill running)
- glycogen depletion
- tendon and connective tissue load
- nervous system fatigue
- sleep disruption (travel, nerves, early start)
So the right question is not "when can I run again".
It is: when can I train again without stacking fatigue.
A realistic recovery timeline (for most runners)
Everyone is different, but this timeline works as a default.
Day 0: race day
Your job:
- cool down 10 to 15 minutes easy
- eat carbs and protein within a couple of hours
- hydrate
- get warm and dry
Days 1 to 2: active recovery
Expect:
- stiffness when standing up
- sleep that can be weird the first night
Do:
- short walk
- gentle mobility
- optional 20 to 30 minute easy spin
Avoid:
- hard running
- heavy lifting
Days 3 to 5: easy runs only
If soreness is improving:
- 20 to 45 minutes easy
- add 4 to 6 relaxed strides only if your legs feel normal
Keep effort low. Your body is still repairing.
Days 6 to 10: return workouts carefully
If recovery signals look normal, you can add one light workout:
- short tempo blocks (for example, 2 x 8 minutes)
- or a few controlled intervals at 10K effort
Avoid max efforts. One good workout is enough.
Days 10 to 14: back to normal (for many)
If you raced hard, this is often when you feel truly back.
If you raced moderately, you may be back sooner.
Use HRV and resting heart rate to decide what to do each day
Wearables are not perfect, but they are useful when you treat them like a dashboard.
The rule that works for most runners
Compare to your normal trend (last few weeks):
- If resting heart rate is up and HRV is down compared to baseline, train easy or rest.
- If resting heart rate is normalizing and HRV is recovering, you can gradually add intensity.
This is not a diagnosis tool. It is a simple safety rail.
What to do if your HRV stays low for a week
If your HRV stays suppressed and your resting heart rate stays elevated 5 to 7 days after the race:
- check sleep duration and sleep timing
- check alcohol and caffeine timing
- check hydration and calorie intake
- check for early illness
If you also feel worse each day, consider medical guidance.
The biggest mistakes after a half marathon
1) Testing yourself too early
The classic error is doing a hard workout 2 to 4 days after the race because your legs feel OK.
You can sometimes get away with it, but it often costs you in sleep and recovery for the next week.
2) No easy movement
Complete rest can make you feel stiffer.
Most runners recover better with:
- walking
- light cycling
- gentle mobility
3) Underfueling
A half marathon creates a real energy deficit.
If you underfuel for several days, your recovery signals often stay worse.
Apple Watch tips for recovery week
- Keep easy runs in low heart rate zones.
- Use the same warmup for your first few easy runs so effort is comparable.
- Look at the weekly trend in Apple Health, not one morning number.
Watch this: recovery and fatigue basics
Quick checklist: return to training after a half marathon
- 1 to 2 days of walking and mobility
- Easy runs only until soreness is mostly gone
- Add one light workout around day 6 to 10 if HRV and resting heart rate are normalizing
- No max effort workouts in the first week
- If HRV is down and resting heart rate is up for multiple days, reduce load
Where Century fits
Century is built to make recovery decisions simpler.
Instead of guessing based on mood, Century helps you:
- track HRV and resting heart rate trends from Apple Health
- connect your race and training load to sleep and recovery signals
- choose "train" versus "recover" with less noise
If you want to feel proud of your race without losing the next two weeks of training, treat recovery like part of the plan.