Does stretching prevent soreness or injury?

No, not by an amount you'd notice. Stretching before or after a workout barely changes how sore you feel the next day.^[1] Stretching programs haven't been shown to lower your overall risk of injury either.^[2] So for lifters, stretching is optional. Do it before or after, as you prefer. Just keep the holds short right before heavy sets.^[3]

Stretching does have one clear payoff: over weeks, it makes you more flexible.^[4] Lifting weights did about as much in the studies.^[5]

You may have been taught to stretch after a session so you won't be sore. Or before one, so you won't get hurt. Both habits feel sensible. Here's what happened when researchers tested them.

Why it matters

Stretching for the wrong reasons costs time. Ten minutes after each of three weekly sessions is about two hours a month. In the studies, stretching around exercise cut soreness by too little to feel.^[1]

It can cost strength too. Holding a stretch for a minute or more right before heavy sets can make you weaker for a while.^[3]

The bigger cost is false comfort. If stretching is your plan for staying uninjured, it's a plan the large trials didn't back.^[2]^[6] None of this makes stretching bad. It just hasn't been shown to prevent soreness or injury.

What the research says

A few terms first. Static stretching means holding a muscle in a stretched position. Dynamic stretching means moving a joint through its range, such as leg swings. DOMS stands for delayed onset muscle soreness: the ache that shows up hours to days after exercise your muscles aren't used to.

A meta-analysis pools the results of many studies on the same question into one estimate. A randomised trial decides by chance who gets which treatment, so the comparison is fair.

Soreness: stretching barely moves it

A Cochrane review (a systematic review run to strict, published methods) pooled 12 studies.^[1] Stretching before exercise lowered soreness a day later by about half a point on a 100-point scale. Stretching after exercise lowered it by about one point.^[1] The results looked similar anywhere from half a day to three days after exercise.^[1]

One large trial had over 2,000 adults. They stretched before and after exercise, and their peak soreness over a week dropped by about 4 points out of 100.^[1] The authors said the drop was unlikely to be chance, but "very small". They concluded that stretching doesn't cut soreness by enough to matter.^[1] Moderate evidence.

Most of these studies were small.^[1] In the 2021 analysis, the volunteers were 17 to 38 and mostly men, and the studies made them sore on purpose.^[7] The authors of the 2021 analysis rated their confidence in the evidence as "very low".^[7]

A 2025 panel of 20 stretching researchers doesn't recommend stretching as a recovery routine. But existing reviews show no sign that it harms recovery, so the panel leaves it to personal preference.^[8] Expert consensus. This is the panel's view, not a tested finding.

Injury: stretching programs didn't cut overall risk

A 2014 meta-analysis pooled 25 trials of exercise programs meant to prevent sports injuries. Together they had 26,610 people.^[2] Stretching programs made no clear difference to injury risk. Only three of the trials tested stretching.^[2] Moderate evidence.

A large stretching trial followed 1,538 male army recruits through 12 weeks of training. Half of them did one 20-second stretch for each of six leg muscle groups in every warm-up. Injury rates came out about the same in both groups.^[6] Limited evidence on its own: one trial, in male army recruits.

The same 2014 analysis found something that did work in its trials. Strength-training programs cut injuries to less than a third.^[2] But those four trials were in soccer players and military recruits, not gym lifters. Each one counted a single kind of injury, such as hamstring or knee injuries.^[2] Moderate evidence, for sport and military settings. It doesn't promise lifters the same drop.

What about muscle strains? The 2025 panel doesn't recommend stretching for injury prevention in general. It notes early evidence that static stretching may cut muscle injuries, possibly at the cost of more bone and joint injuries.^[8] A 2016 review found no clear effect of static stretching on all-cause or overuse injuries (injuries that build up from repeated strain, not one accident).^[9] Mixed evidence.

No study shows that one stretching session before training prevents injuries. Studies of stretching before training only test the effect of months of regular stretching.^[8] Expert consensus.

Before lifting: keep the holds short

How to warm up covers this in detail. The short version: the longer you hold a static stretch, the more strength you lose for a while afterwards. Holds of 60 seconds or more per muscle cost the most.^[9]^[3] A 2012 review of 106 studies found that holds under 30 seconds had no harmful effect.^[10] Strong evidence. Most of those studies tested single muscles on lab machines, such as leg extensions or calf raises, not barbell lifts.^[3]

Short static stretches inside a moving warm-up are fine, and so are dynamic stretches.^[8] The extra range you get from stretching before a session usually fades within 30 minutes.^[9] The 2025 panel says stretching isn't essential in a warm-up.^[8]

What stretching is good for: flexibility

Range of motion is how far a joint can move. A 2024 meta-analysis of 77 studies found that stretching for at least two weeks improved it by a moderate amount, compared with not stretching.^[4] Static stretching and PNF stretching gave bigger gains than dynamic stretching.^[4] (PNF is a stretch where you briefly tense the muscle against resistance, relax it, then stretch a little further.) Women gained more than men.^[4] Strong evidence.

If flexibility is your goal, the 2025 panel suggests static or PNF stretches: 2–3 sets a day, each held 30–120 seconds per muscle.^[8] Expert consensus.

Lifting does this job too. Resistance training means working your muscles against a load, such as weights or machines. A 2023 meta-analysis of 55 studies found that it improved range of motion.^[5] In the studies, it improved about as much as stretching did. People who were untrained at the start gained the most. Training with only your body weight was the exception: the studies couldn't show a clear gain from it.^[5] Moderate evidence.

The authors concluded that stretching before or after lifting may not be needed to improve flexibility.^[5] The 2025 panel agrees that lifting through a full range improves flexibility at least as much as stretching.^[8] Expert consensus. That's one more reason to lift through the full range of motion you can control.

Muscle and strength: a little, mostly at high doses

Stretching on its own builds a little strength and muscle. A 2024 meta-analysis of 42 trials, with 1,318 people, found small gains in both.^[11] Limited evidence, for a small effect: the authors rated their certainty as low. Most of the trials stretched a single muscle, usually the calves or hamstrings.^[11]

For muscle size, only the bigger doses worked: longer stretches, more often, over longer programs. Lower doses showed no clear effect on size.^[11] The studies split at 15 minutes a session, five sessions a week and six weeks.^[11] The 2025 panel says more than 15 minutes per muscle a day, for six weeks or longer.^[8] Expert consensus.

A second meta-analysis, of 25 studies, called the effect of stretching on muscle size unclear.^[12] Mixed evidence for muscle size. The 2025 panel doesn't recommend stretching as a main way to build muscle. For strength, it says lifting is far more efficient.^[8] Expert consensus. Stretching is not a stand-in for training.

How to apply it

These steps are coaching practice, not a tested finding. They follow from the evidence above.

Stretch if you like it. Skip it if you don't. Neither choice changed soreness or overall injury rates by much in the studies.
Before heavy sets, keep each hold under 30 seconds. Then do your warm-up sets.
Want more flexibility? Give it its own slot. After training or at home, do 2–3 holds of 30–60 seconds per muscle, most days.
Lift through your full range. It builds flexibility as well as strength.
Don't stretch to fix soreness. For what soreness is and when to worry, see your first month.

Say you lift three days a week and you'd like to touch your toes. A plan could look like this:

Most days, after training or at home: a hamstring stretch, 3 holds of 45 seconds per leg.
Squat day, before your working sets of 60 kg × 8: if you want to stretch, 2 holds of 20 seconds. Then ramp-up sets at 20 kg, 30 kg and 45 kg.
Sore legs on day two? A stretch won't change that by much.^[1]

If your lifts already move through a full range, extra stretching is optional.

Common mistakes

Stretching to beat soreness. It feels like it should help. In the studies, it moved soreness by about a point on a 100-point scale.^[1] Fix: drop it as a soreness cure. Keep it if you just like it.
Long holds right before heavy sets. It looks like the careful choice. Holds of a minute or more can lower your strength for a while.^[3] Fix: keep each hold under 30 seconds, then do your warm-up sets.
Treating stretching as your injury plan. It sounds like a sensible plan. But stretching programs didn't cut overall injury risk in the trials.^[2] Fix: stretch for flexibility if you want it, and learn each lift with light weights first.
Thinking lifting makes you stiff. "Muscle-bound" is an old worry. In the studies, resistance training improved range of motion.^[5] Fix: lift through a full range.
Calling every pain soreness. Soreness is a dull ache in the muscle you trained. If a pain is sharp, sits in a joint, or isn't getting better, treat it as a possible injury. Coaching practice. If you have pain or an injury, talk to a doctor or physiotherapist before you keep training.

How Gymbers fits

Warm-up sets belong on the log. The Gymbers app can add warm-up (ramp-up) sets before your working sets, and you can log your warm-up sets too. Exercises come with a video, so you can see the full range of a lift before you load it.