Missed a Week of Running? What to Do Next, and What Not To
Patricia Bedoya
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7
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Cover image generated with AI — © Chubby Studio S.L.
KEY TAKEAWAY
After a missed week of running, do not make up the lost runs: rejoin your plan where the calendar says, keep the first few runs easy and slightly shorter, and keep your next long run within your longest of the last 30 days. Two weeks off cost trained runners only about 4% of their VO2 max.
If you missed a week of running, do not make up the missed runs. Rejoin your plan where the calendar says you are, run the first few days easy and a little shorter than written, and add your next hard session only once an easy run feels normal again. One week off costs far less fitness than it feels like.
The week itself is rarely the problem. What turns a missed week into a lost month is the reaction to it: cramming the runs back in, jumping straight to the long run you skipped, or deciding the whole plan is ruined and quietly stopping. Each of those has a better alternative, and the research behind them is clearer than most running advice suggests.
Did a week off cost you your fitness?
Very little of it. In a classic study of trained distance runners who stopped completely for two weeks, maximal oxygen uptake fell by about 4%, from 61.6 to 58.7 ml/kg/min, and running economy did not change at all. A week is half that break, so the loss after seven days is smaller still.
What moved more in that study tells you how the first run back will feel. Time to exhaustion on the treadmill test dropped by about 9%, heart rate at the same submaximal pace rose by 11 beats per minute, and estimated plasma volume fell by about 5%. In other words, the engine is mostly intact, but the same pace costs more heartbeats for a while. That is the heavy-legged, slightly breathless feeling of the first run back, and it fades quickly once you are running regularly again.
How much you lose also depends on how trained you were. A review of short-term detraining by Iñigo Mujika and Sabino Padilla found that highly trained athletes lose aerobic fitness and blood volume quickly when they stop, and that the same changes are more moderate in people who had only recently started training. If you are a few months into running, a week off is a pause, not a reset.
Should you make up the missed runs?
No. Squeezing last week's runs into this week, or bolting the missed distance onto your next long run, is the most common mistake after a break and the most likely to hurt you. The missed sessions are gone, and that is fine: one week of training was never what your fitness depended on.
The best evidence for why comes from a 2025 study of 5,205 runners followed for 18 months. Single runs more than 10% longer than the longest run of the previous 30 days were linked to a higher rate of overuse injury, while week-to-week changes in total distance were not. A missed week shortens that 30-day record, so the long run you skipped can become the biggest spike of your month if you simply slot it back in. We cover the full study, and why a single long run matters more than your weekly total, separately.
Cramming also costs you the thing the plan was built around: recovery between hard days. Three sessions packed into four days means each one is run on legs that have not absorbed the last, and the extra fatigue lands on top of the small detraining you are already carrying.
Where do you rejoin your training plan?
At the week the calendar says you are in, with the first three or four days eased down. Run your planned easy runs at an easy effort and trim them a little, skip or soften the first interval or tempo session, and keep the next long run no longer than your longest run of the last month. If that easy week feels normal, carry on with the plan as written. A break of months or years is a different problem, closer to running again after years off.
Where you are in the plan changes what to protect. Far from a race, a missed week barely matters and the plan absorbs it. In the final six to eight weeks, keep the long run and one quality session, and let the extra easy runs go first. Inside your taper, never add volume to compensate: the taper exists to shed fatigue, not to repay it.
You will often see a precise figure for the first week back, such as 70% of planned volume. Those percentages are coaching convention, not something a study has tested. They are a reasonable starting point, and so is simply running easy and listening to how the runs feel.
See what your first runs back really cost
FitWoody tracks your training load and analyses every run against your own cardiac load and recovery baselines, so after a week off you can see how your body is handling the return instead of guessing from pace. Comes with a 7-day free trial.
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Does the reason you missed a week change the comeback?
Yes, more than the length of the break does. The same seven days can be a non-event or a warning, depending on why they happened.
A busy week, travel or a holiday
Rejoin the plan as above. If travel crossed time zones, expect sleep and resting heart rate to take a few days to settle, and keep the first runs easy until they do.
A cold, flu or other illness
Wait until you feel properly well, then come back more gently than you would after a holiday, because illness taxes the body even when the calendar only shows rest. Your overnight resting heart rate and HRV are the best witnesses here, and we have written about which numbers to trust and which to ignore after a sick week. If the illness involved a fever, chest pain, breathlessness or palpitations, ask your doctor before you run again.
A niggle, pain or an injury
This is the one case where the advice above does not apply. If you stopped because something hurt, the question is no longer how to rejoin the plan, it is whether the tissue is ready, and that is a question for a physiotherapist or doctor, not a training app or a blog. Your data can record what each run asked of you on the way back. It cannot tell you how an injury is healing.
You simply lost the motivation
Then the plan was probably asking for more than your week could give, and the fix is a smaller plan, not a harder one. A missed week reads as failure mostly through the lens of all-or-nothing thinking about training, where anything short of perfect counts as zero.
What will your watch show in your first week back?
Expect a higher heart rate for your usual easy pace, the same pattern the runners in that two-week study showed. It is the plasma volume and fitness dip catching up with you, and it eases as regular running brings both back. Judge your first runs by effort and breathing, not by the pace your watch says you used to hold.
Training load charts will look odd for longer. Apple Watch compares your last 7 days of workouts with the previous 28, so the missed week first reads as a collapse and then, for a few weeks, makes an ordinary week look like a jump. A load warning in the month after a break says more about the gap than about you. If the ratio itself is new to you, how training load works covers it in full.
Did missing a week break the habit?
Probably not. In a 12-week study of how habits form in everyday life, researchers at University College London found that missing a single opportunity did not materially affect how the habit formed. That study looked at missed days rather than missed weeks, so it is not proof that a week never matters. What it does show is that the habit lives in the repetition, and the repetition resumes the moment you put the next run back in its usual slot.
That makes the first run back the important one, not the week you missed. Keep it at the same time and on the same day you normally run, make it short enough that you finish wanting more, and let the rest of the week follow.
How FitWoody reads a week off
FitWoody is an iOS app for iPhone, iPad and Apple Watch that reads the data your watch already records. It tracks your training load and analyses every run against your own cardiac load and heart rate zones, so a slow first run back is read for what it cost you rather than judged by pace. Your recovery baselines, built from HRV, resting heart rate, body temperature, blood oxygen and respiratory rate, show whether you are absorbing the work, and your daily goal adapts to your load, your sleep and those overnight signals. An Apple Watch is required.
What to do this week
Find your place in the plan and stay there. Run the next three or four days easy and slightly shorter, keep your next long run within your longest run of the last month, and add the next hard session once an easy run feels like an easy run again. If you stopped because something hurt, start with a physiotherapist instead. A missed week is part of a training year, not a break in it. Showing up again, in any form, counts.
Frequently asked questions
Should I make up missed runs after a week off?
No. Rejoin your plan at the current week instead. Cramming the missed runs into the next few days stacks fatigue, and slotting a skipped long run straight back in can make it far longer than anything in your last 30 days, the kind of single-run spike linked to more overuse injuries in a 2025 study of 5,205 runners.
How much fitness do you lose in one week of not running?
Very little. Trained distance runners who stopped completely for two weeks lost about 4% of their VO2 max, and their running economy did not change. After one week the loss is smaller still. What you notice more is a higher heart rate at your usual easy pace, which eases once you run regularly again.
How should my first week back after missing a week look?
Run the planned easy runs easy and a little shorter, soften or skip the first hard session, and keep the long run within your longest run of the past month. If those runs feel normal, continue with the plan as written. If you stopped because of pain or an injury, see a physiotherapist or doctor before resuming.