A survey of 1,145 UK park runners found that 570 of them were dealing with some type of injury during the run itself.
From minor tweaks to gait-altering injuries, more than half the runners were making one of the major mistakes physical therapists see most injured runners do.
Most of the other major mistakes sound sensible: rest the injury completely, stretch before you run, roll out the calf that keeps going tight.
But, these are largely based on myths and running-specific physical therapists wish runners would stop doing them.
So, in this article we’re going to…
- Detail the 9 mistakes physical therapists see runners make the most
- What the research says about each
- And how to change your approach and what to do differently
1. Running Until the Pain Changes Your Stride
Running through pain that alters your stride is the fastest way to turn one injury into two.
When you limp to compensate for an existing injury, you shift impact, loading, and force to another area of the body that isn’t designed to handle that extra work.
The moment your stride changes to protect something, the run is over and you walk home.
Most runners keep going because they cannot tell soreness from damage.
Delayed onset muscle soreness is dull, spreads across a whole muscle group, shows up on both legs, and eases as you warm up.
Injury pain is sharp, sits in a spot you can cover with one fingertip, usually shows up on one side only, and gets worse the longer you run.
How to Decide Whether to Start Today’s Run
Run three checks before you head out the door.
- Press the sore area with one finger. A single point that makes you flinch, especially over bone, means skip the run and book an appointment.
- Hop 10 times on the sore leg. Pain on landing that you do not feel on the other leg points to bone or joint involvement.
- Run the first 10 minutes at conversational effort. Pain that fades as you warm up is usually safe to continue, and pain that climbs means you stop.
The stride rule overrides all three checks: if your gait changes at any point, the run ends there.
2. Calling Total Rest a Rehab Plan
Taking two full weeks off and expecting the tissue to be stronger when you come back is the most common rehab mistake in running.
Tendon, muscle, and bone build capacity in response to load.
Remove the load entirely and you limit the body’s ability to adapt and when you return to running your muscles, tendons and bones are less capable of handling your old mileage.
This has been tested directly in runners.
Researchers randomized 38 people with Achilles tendinopathy into two groups.
One group kept running and jumping throughout, held to a pain rule, and the other stopped all tendon-loading activity for the first six weeks.
Both groups tracked Achilles pain, stiffness, and how much running the tendon tolerates and given a score from 0 to 100. Both groups started at a score of 57.
Twelve months later the runners who never stopped scored 85 and the rest group scored 91, with no difference between them in how quickly they recovered.
Six weeks of no running cost those patients six weeks of training and bought them no faster recovery.
How to Keep Loading an Injured Tendon Without Making It Worse
That trial used a pain-monitoring rule you can apply to most soft-tissue injuries.
- Pain during the activity can reach 5 out of 10. Below that line, keep going. Above it, cut the session short.
- Pain must settle by the next morning. Soreness still elevated 24 hours later means the load was too high.
- Pain must not climb week to week. A stable or falling weekly pain score means the progression is working.
Confirmed bone stress injuries are the exception, and they need protected weight bearing under a doctor’s supervision before any loading progression starts.
3. Treating the Spot That Hurts
I injured runners rightly focus their primary efforts on treating the area that hurts.
But, most never go beyond treating the symptoms producing the pain.
A calf that goes tight on one side, an arch that aches, an outer knee that flares at mile four: each is usually a tissue absorbing forces a hip or a trunk failed to control.
Weakness in the gluteus medius, the muscle on the outside of your hip that holds your pelvis level, lets the pelvis drop on the swing side with every step.
That drop tilts the knee inward and drives load down into the shin, the arch, and the outside of the knee.
The strongest evidence for where to put your strength work comes from a trial that compared two targets head to head.
In a 24-week trial of 325 runners, a hip and core program cut the weekly prevalence of overuse injuries by 39%. A foot and ankle program in the same trial produced no reduction at all.
The hip and core group also had 52% lower prevalence of the serious overuse injuries that stop you training altogether.
How to Find the Link That’s Actually Failing
Three tests will show you where the control is missing, and you only need a mirror.
- Single-leg squat, facing a mirror. Watch whether the knee drifts inward or the opposite hip drops. Compare left to right.
- Single-leg calf raises to failure. A difference of more than three or four reps between legs is a target worth working on.
- Side plank hold, both sides. A gap of more than 15 seconds points to trunk control that stops holding your pelvis level under fatigue.
Load the weaker side twice a week with single-leg deadlifts, step-downs, split squats, and loaded side-lying hip abduction.
4. Doing the Same Three Rehab Exercises at the Same Weight for Months
Clamshells with a red band, glute bridges, and a 30-second calf stretch will get you through week one of rehab and nowhere near week eight.
Running already delivers thousands of low-load muscle contractions per session, so more low-load work adds very little the sport is not already providing.
What running does not provide is heavy loading, and heavy loading is where the protective effect lives.
A meta-analysis of six randomized trials covering 7,738 athletes found that strength training cut injury risk to roughly a third of the control rate.
The same analysis found the effect was dose dependent: every 10% increase in strength training volume dropped injury risk by more than four percentage points.
More load and more volume produced more protection, with no ceiling identified in the data.
How to Progress a Rehab Exercise Every Single Week
Move each exercise up one rung whenever you can finish all your sets with two reps left in the tank.
- Rung 1: both legs, bodyweight, controlled tempo
- Rung 2: both legs, bodyweight, three-second lowering phase
- Rung 3: single leg, bodyweight
- Rung 4: single leg with dumbbells or a loaded backpack
- Rung 5: single leg, heavy, 4 to 6 reps where the last rep is genuinely hard
Two sessions a week is the minimum that produced results in the research.
Put those sessions on your hard running days so your easy days stay easy.
5. Using Stretching as Your Injury Prevention Plan
Most runners were taught that tight muscles cause injuries and that stretching prevents them.
Stretching as injury prevention has now been tested against that claim across tens of thousands of athletes, and it does not hold up.
A meta-analysis of 25 randomized trials covering 26,610 participants and 3,464 injuries found that stretching programs produced no measurable reduction in injury rates.
Strength training in the same analysis cut injuries to under a third, and balance work roughly halved them.
Stretching still has a place.
It improves range of motion, it feels good on a stiff hip flexor, and no evidence suggests it causes harm.
It earns none of the ten minutes you are spending on injury prevention.
How to Spend Your Ten Minutes Before a Run
Replace the static holds with a warm-up that raises tissue temperature and rehearses the movement you are about to do.
- Walk or jog easy for 3 to 4 minutes. This raises muscle temperature, which is the actual mechanism behind a warm-up.
- Do 5 to 6 minutes of dynamic work. Leg swings front to back and side to side, walking lunges, A-skips, and high knees.
- Finish with 4 strides of 20 seconds. Build to roughly 5k effort and float back down.
Save the long static holds for after the run or for a separate mobility session on an easy day.
6. Taking Ibuprofen Before a Run or a Race
Pre-race ibuprofen is common enough to show up in most ultramarathon fields, and it carries a measurable cost to your kidneys.
Running already reduces blood flow to your kidneys, and dehydration reduces it further.
Ibuprofen works by blocking prostaglandins, hormone-like compounds that keep the blood vessels feeding your kidneys open under that kind of stress.
In a randomized placebo-controlled trial of 89 ultramarathon runners, 52% of those taking ibuprofen developed acute kidney injury during a 50-mile (80 km) race, compared with 34% on placebo.
One extra case of kidney injury occurred for every 5.5 runners who took the drug.
The second problem is the one physical therapists care about more.
Pain is the signal that tells you your stride is about to change.
Blunting it on race morning removes the only warning system you have between mile 6 and mile 20.
How to Handle Race-Day Aches Without Reaching for NSAIDs
Fix the input in the weeks before the race, then manage the morning with things that do not touch your kidneys.
- Extend the warm-up. Give a cranky Achilles or a sore hip a full 15 minutes and two extra strides.
- Use caffeine. It lowers perceived effort and has a strong performance record with no renal effect.
- Talk to your doctor about non-NSAID options if you genuinely need pain relief on race day.
Hold off on anti-inflammatories for the first 48 hours after the race as well, because that window is when tendon and bone remodeling signals are strongest.
7. Underfueling Through a Training Block — The Strongest Predictor of a Stress Fracture
Chronic underfueling predicts bone stress injuries better than any biomechanical measurement anyone has tested.
Runners with textbook mechanics get stress fractures, and runners with poor mechanics often do not.
What separates them most reliably is whether they ate enough to cover their training.
Low energy availability suppresses estrogen, testosterone, IGF-1, and thyroid hormones.
The IOC consensus statement on Relative Energy Deficiency in Sport identifies that hormonal suppression as a primary driver of bone loss in endurance athletes.
Your bones stop laying down new tissue, and the calcium you are taking does not change that.
Across 156 male distance runners followed for up to seven years, 27% sustained a bone stress injury. Each one-point rise in a risk score built mainly from energy availability and body mass predicted a 37% higher injury rate.
The pattern repeats in women, where a five-year prospective study of female runners found more than four times the rate of bone stress injuries in the highest-risk group.
How to Tell Whether You’re Fueling the Training You’re Doing
These signs show up weeks before a bone gives out.
- Body weight drifting down during a build when you were not trying to lose weight
- Appetite that disappears after hard sessions and returns as intense hunger at night
- Cold hands and feet and difficulty staying warm on easy runs
- Broken sleep and a resting heart rate that will not settle
- Missed or irregular periods, which is a symptom and a driver at the same time
Eat carbohydrate before every run over 60 minutes, refuel within an hour of finishing, and add a real snack on any day over 8 miles (13 km).
A training build is the wrong time to be in a calorie deficit.
8. Running Every Mile in Your Race Shoes
Carbon-plated race shoes earn their place on race day and cause problems when they become your only pair.
The plate stiffens the forefoot and shifts work away from your foot and ankle, which changes where load lands on every stride.
Sports medicine researchers documented five navicular bone stress injuries in competitive runners using carbon fiber plate footwear, and flagged a slow transition as the sensible precaution.
Variety in what you put on your feet also has prospective data behind it.
Tracking 264 runners over 22 weeks showed roughly 39% lower injury risk in those who rotated between multiple pairs of shoes.
Keep the plated shoes for races and one key session a week, and rotate two other pairs with different stack heights and drops through your easy mileage.
9. Running Easy Days at Moderate Effort
Easy days that drift into moderate effort sit underneath a large share of the overuse injuries that reach a clinic.
Most runners hold their easy pace somewhere between genuinely easy and comfortably hard, because that pace feels productive and the watch number looks respectable.
That zone is too hard to recover from and too easy to trigger adaptation.
You arrive at your hard sessions already fatigued, so you cannot reach the intensities that drive fitness.
Your tissue never gets a genuinely low-load day to remodel either.
The load that breaks a tendon is rarely the load from one session.
A systematic review of 36 studies covering 23,047 runners found no consistent link between injury and any single training parameter, including weekly distance, frequency, or intensity on its own.
Total accumulated stress across the week is what matters, and easy days that are not easy are the largest hidden contributor to that total.
How to Make Your Easy Days Actually Easy
Use effort, not pace, and be willing to be slower than you expect.
- Hold a full conversation in complete sentences. If you are speaking in short bursts, you are running too hard.
- Add 60 to 90 seconds per mile (about 40 to 55 seconds per km) to your marathon pace. That range is where most everyday runners’ easy pace actually sits.
- Cap easy days by time, not distance. Fatigue changes your mechanics late in a run, and a time cap stops you chasing a round number on tired legs.
Give this four weeks before you judge it, because the first two weeks feel like you are wasting your training.
Start With the Two Habits That Cost You the Most
Nine habits is more than anyone can change at once, so pick the two with the largest effect on this list.
Add two heavy strength sessions a week built around single-leg work for the hips and trunk.
Progress the load every week you can finish your sets with two reps to spare.
Then slow your easy days down until you can talk in full sentences the whole way.
If you are hurt right now, apply the stride rule from item one on your next run before you change anything else.
