Returning to Running After an Injury

First, what kind of injury it is

The injury decides whether you stop running. With a bone stress injury, impact stops for a period and a clinician sets the return (see stress fractures). With a tendon injury, you can often keep running at a level the tendon tolerates and replace the excess with other aerobic work. The 2024 US physical therapy guideline for midportion Achilles tendinopathy says complete rest is not indicated, advises continuing your activities within pain tolerance, and lists pain monitoring as a self-management skill¹. See the guide on Achilles tendinopathy.

For anything more than a minor ache, and always for a diagnosed injury, a physical therapist's plan is built for the tissue and the timeline. Use this guide for the order of the steps and your clinician's plan for the details.

While you wait

Replace the running with aerobic work that adds no lower-body impact, such as cycling, swimming or pool running, at an easy conversational effort, which is zone 2 in a five-zone model. A week out with cross-training is not a worry.

Time off costs endurance, and the cost grows with the weeks. A 2024 systematic review of detraining in endurance athletes lists maximal oxygen uptake falls of about 4% to 7% in studies of 12 days to 3 weeks and 13% to 20% after 8 weeks, and concludes that a partial reduction in training may limit the loss. The review does not cover cross-training². In a 1996 trial of 16 trained male runners, six weeks of deep water running in place of land running maintained maximal oxygen uptake, ventilatory threshold and running economy³. So keep aerobic work going while you wait.

The checks before the first run

Run again when you can pass these checks, which physical therapists Tom Goom and Vikash Sharma use:

• You can walk briskly for 30 minutes without pain.
• You need no pain medication to run.
• You can hop 10 times in a row on the injured leg without pain.
• You trust the leg. If you are afraid to run, say so to your clinician or coach, because being ready in your head counts as much as the leg.

After a bone injury, the gate is your clinician's

A 2024 scoping review of 50 sources on returning to running after a tibial bone stress injury, mostly reviews and clinical commentaries, lists five things to address before running resumes: resolution of bony tenderness, pain-free walking, radiological healing in high-risk injuries, strength, functional and loading tests, and the factors that contributed to the injury. It describes a graduated program that often starts with walk-run intervals and advances distance ahead of speed, and says the decision should be shared between clinician, coach and athlete⁴. For low-risk tibial and metatarsal injuries, a 2021 clinical review describes starting a return-to-run program once you have been pain free in daily activities for 5 consecutive days, with symptoms directing progress and running volume raised before speed. Its authors call the approach clinically successful but in need of further scientific validation⁵.

The first runs

Start with a dose you know you can finish, at an easy talking pace. After a bone injury or a long layoff that usually means run-walk, joined at the step you can finish now: the NHS Couch to 5K starts at 1 minute of running and 90 seconds of walking for 20 minutes, three times a week with a rest day between.

After a short layoff or a minor injury, the first runs are a ladder: an easy 20 to 30 minutes with no discomfort, then 45 minutes, then two 45-minute runs on back-to-back days and a day off. Runners are usually back to their normal load 2 to 3 weeks in. After a bone injury or a long layoff, your clinician's pace comes first.

Once a small ache shows up, physical therapist Vikash Sharma's rule for returning runners decides each run. Your clinician may set a different limit:

• Run only while pain stays at 3 out of 10 or lower (4 at most) and is stable or improving over the weeks.
• Stop the run if it climbs above that, and expect it back to its usual level within 24 hours of finishing.
• A limp, or any change in how you move, is a stop. The guide on pain versus soreness covers the signs.

Building back

Hit each step a couple of times before you take the next. On run-walk, lengthen the running pieces and shorten the walks as the sessions stay free of warning signs. Build how often you run and how long you run first, and add speed last, since injury risk rises with speed.

Build from where you are now and not from your old numbers, which tempt a returning runner to overshoot (McClung and Dods). Fold your rehab exercises into your regular strength work and scale them back instead of dropping them (see strength training for runners). The guide on progressive overload covers how fast to build.

Speed and hills

Add speed after you have run 30 minutes continuously at an easy, conversational effort twice, and add it in the smallest dose, such as short strides after an easy run. Hills and fast running come back last, one at a time, only while they are pain-free, and downhill comes after uphill. When your volume is back to your old level, you are training again and not just running.

When it flares

A bad week is a repeat, not a failure. In practice a setback is usually small tissue irritation that settles in days to a couple of weeks. A brief twinge that settles quickly is usually fine; pain you grit your teeth through is not. Go back to the last dose that felt fine, repeat the week and keep going.

See a professional if the pain comes back every time you build up, if you cannot tell whether you are ready to progress, or if any bone pain returns.