Stretching can make you more flexible within minutes. Whether that actually makes you less likely to get injured is a different question.
You have probably seen the ritual hundreds of times.
A runner pulls one heel toward the glutes. Someone at the gym reaches for their toes and holds. A recreational athlete stretches a hamstring before stepping onto the court.
Different movements, same assumption: stretch now, and you are less likely to get hurt later.
It sounds reasonable. Stretching can increase range of motion and make muscles feel less tight. If you are about to run, jump, lift, or change direction quickly, being more flexible seems as though it should offer some protection.
But when researchers stop measuring flexibility and start counting actual injuries, that simple relationship becomes surprisingly difficult to find.
Controlled trials and systematic reviews have generally failed to show that routine pre-exercise static stretching produces a clear reduction in overall injury risk. Some evidence suggests certain muscle, tendon, or ligament injuries may be different, but that is a much narrower claim than saying stretching broadly “prevents injuries.”
The confusion becomes easier to untangle once three things that exercise culture often bundles together are separated:
Flexibility, stretching, and warming up.
They are related. They are not interchangeable.
Stretching Makes You More Flexible. That Doesn’t Automatically Mean Fewer Injuries
Static stretching is the familiar kind: move a muscle toward the end of its comfortable range and hold the position.
It unquestionably does something.
A large systematic review and meta-analysis involving 189 studies found that both single sessions and repeated programs of static stretching improved flexibility. The effect after a single session was moderate; with longer-term stretching programs, it was larger.
That helps explain why the injury-prevention argument became so intuitive.
Imagine a muscle suddenly lengthening during sport. It seems logical that a muscle capable of comfortably moving through a greater range would be less likely to strain. From there, it is only a short step to more flexibility means fewer injuries.
But that last step is a hypothesis.
Range of motion is a physical measurement. Injury is a real-world outcome influenced by many things—forces, fatigue, training exposure, previous injury, strength, movement demands, collisions, surfaces, and sometimes simple bad luck.
Changing one measurement does not automatically change all those pathways.
Fortunately, researchers do not have to guess. They can count injuries.
When Researchers Count Injuries, the Effect Mostly Disappears
One influential trial studied 1,538 Australian Army recruits during 12 weeks of physical training.
Everyone performed an active warm-up. The stretching group then added static stretches for six major leg muscle groups before exercise, while the control group did not.
The result?
Stretching did not significantly reduce overall lower-limb injuries. The estimated hazard ratio was 0.95, with a confidence interval wide enough to include both some benefit and no benefit.
Military recruits are obviously not identical to recreational runners or gym members. But broader reviews have reached much the same conclusion.
A systematic review of static stretching during warm-ups found that all four randomized trials it identified failed to show a significant reduction in overall exercise-related injuries. The authors concluded that there was moderate-to-strong evidence against routine static stretching producing a general reduction in injury rates.
A later review pooling three military trials involving 3,532 participants reached a similar result: static stretching produced an estimated risk ratio of 0.93 for musculoskeletal injuries, with the confidence interval crossing no effect. The certainty of that evidence was rated low, so the result should not be treated as definitive proof that stretching can never help. But it provides little support for stretching as broad injury insurance.
Then came an especially useful real-world trial.
Participants were assigned either to stretch seven lower-body and trunk muscle groups before and after physical activity for 12 weeks or to avoid stretching. Once again, stretching barely moved overall injury risk: the hazard ratio was 0.97.
These studies have limitations. Some of the injury literature is old. Stretching protocols differ. Adherence is imperfect. Several influential trials involved military populations rather than ordinary exercisers.
Still, the broad message has been remarkably stubborn:
If routine static stretching substantially prevented injuries in general, controlled studies should have had an easier time showing it.
They haven’t.
But “Injury” May Be Too Broad a Category
There is an important reason not to replace the old rule with an equally simplistic new one: stretching never prevents injuries.
“Injury” covers very different events.
A muscle strain is not a stress fracture. A tendon injury is not an ankle sprain. A collision injury is not an overuse injury.
There is little reason to assume that an intervention affecting muscle-tendon range of motion would influence all of them equally.
And here the evidence becomes more interesting.
The systematic review of static stretching found preliminary evidence that muscle-tendon and ligament injuries might respond differently from injuries overall. Three of the seven included studies reported reductions in these types of injuries even though overall injury rates did not significantly fall.
The 12-week pragmatic trial produced an even clearer signal. Stretching did not meaningfully reduce total injuries, but muscle, ligament, and tendon injuries occurred at a rate of 0.66 per person-year among people assigned to stretch versus 0.88 among controls—a statistically significant reduction.
That is worth taking seriously.
It is not enough to restore the old promise.
The category still combines different tissues and injury mechanisms, and the broader literature has not established that a few pre-workout stretches reliably prevent a particular injury across different sports and populations.
The most defensible conclusion is narrower:
Static stretching has not demonstrated reliable protection against injuries overall. It may be more relevant to certain muscle-tendon or related injuries, but that possibility is much less certain.
This also explains why flexibility can matter without more flexibility always meaning more protection.
Some activities genuinely require large ranges of motion. A gymnast, hurdler, martial artist, or other athlete who repeatedly reaches demanding joint positions has different mobility requirements from someone going for an ordinary jog.
Having enough range of motion for the activity matters.
That is not the same as saying everyone needs to stretch before exercise to avoid injury.
Stretching Is Not the Same as Warming Up
This is where the debate often goes wrong.
If static stretching is not a proven injury shield, it can sound as though the alternative is to walk onto a field or into a gym completely cold and immediately begin at maximum effort.
That does not follow from the evidence.
A warm-up is a broader process of preparing for the activity ahead. It can include easy movement, gradually increasing effort, balance or landing work, and rehearsal of movements similar to those about to be performed.
Stretching can be part of that process. It is not the process itself.
That distinction matters because some structured warm-up and neuromuscular programs do have stronger injury-prevention evidence.
A 2025 meta-analysis of 24 randomized trials found that neuromuscular training programs reduced lower-extremity injuries by about 27% among adolescent and young athletes. These programs were not simply stretching routines: they used combinations of exercises intended to develop strength, balance, coordination, movement control, and related abilities.
A 2026 meta-analysis of 25 randomized trials involving more than 10,000 athletes similarly found lower injury risk with integrative neuromuscular training, although the studies varied considerably and many had methodological concerns.
Those findings do not prove that stretching was responsible.
That would be like testing a recipe with several ingredients and crediting one ingredient for the entire result.
Dynamic stretching creates a similar source of confusion. Unlike a static stretch, which holds a position, dynamic stretching moves the body through controlled ranges of motion. Those movements can fit naturally into a progressive warm-up.
But evidence supporting a multicomponent warm-up cannot automatically be converted into evidence that dynamic stretching by itself prevents injuries.
The distinction is simple but important:
“Warming up can be useful” and “stretching prevents injuries” are not the same scientific claim.
So Do You Need to Stretch Before Exercise?
That depends on what you expect stretching to accomplish.
If you need greater range of motion for the movements you are about to perform, stretching can serve a clear purpose. If brief stretches make you feel comfortable and prepared, there is no need to treat them as forbidden.
But you do not need to perform generic static stretches simply because skipping them feels dangerous.
There is also a separate performance question. Long static stretches immediately before maximal strength efforts can temporarily reduce force production. A 2016 review found larger performance reductions when a muscle group was stretched for 60 seconds or longer, while shorter stretches produced much smaller effects.
More recent evidence makes that warning less dramatic. A 2024 systematic review confirmed a temporary reduction in maximal strength after static stretching lasting more than 60 seconds when tested in isolation, but found no significant overall impairment in explosive strength, jumping, or sprinting.
So this is not a reason to replace one rigid rule with another.
The more useful approach is to match preparation to the activity ahead.
The old stretching ritual survived partly because it contains an obvious piece of truth: stretching really can change how far you can move.
What the evidence does not support is the leap from that fact to the promise that a few stretches before exercise provide broad protection against getting hurt.
A hamstring stretch may give you more range of motion. That may be useful. It simply is not the same outcome as preventing a future strain, sprain, fracture, or overuse injury.
Stretch when greater range of motion is useful for what you are about to do. Warm up in ways that prepare you for the movements and intensity ahead. But don’t treat a few pre-workout stretches as proven insurance against injury.
