You want a number: hold it for X seconds. Every guide you've read has given you one, usually with a lot of confidence behind it. Here's the honest version instead: the research on this doesn't support any specific number, and the actual answer is more useful than the one you were looking for.
The number doesn't do what you think it does
A 2024 meta-analysis pooled 77 studies and 186 effect sizes on stretching and range of motion (Konrad et al., Journal of Sport and Health Science). Stretch training works — it produced a moderate improvement in range of motion compared to not stretching at all. That part is settled.
What isn't settled, because the data doesn't support it, is that any particular hold time, weekly volume, or session frequency is what drives that improvement. In the authors' own words: "neither volume, intensity, nor frequency of stretching were found to play a significant role in ROM yields."
So whatever specific count you've seen recommended isn't necessarily wrong to follow — it's just not doing the special thing people assume it's doing. The gain comes from stretching regularly, not from optimising the clock.
What actually moved the needle
Two things in the same analysis did matter:
- Style. Static stretching and PNF (contract-relax techniques) produced greater range-of-motion gains than ballistic or dynamic stretching over time.
- Consistency. Showing up to stretch, repeatedly, over weeks — the studies in this analysis ran as programs, not one-off sessions.
Neither of those is a duration. That's the pattern worth internalising: the lever here is doing it, not doing it for precisely the right number of seconds.
If you're also curious how long you should be able to hold a static position rather than a stretch, how long you should hold a plank and how long you should hold a wall sit cover that — different question, same "test yourself, don't chase a magic number" answer.
The one place duration genuinely matters — and it's not this one
There's exactly one context where hold time has a measurable, data-backed effect: stretching immediately before strength or power work. A separate review (Behm et al. 2016) found that static stretches held under 60 seconds per muscle cost about 1% of subsequent performance, while holds of 60 seconds or more cost closer to 4.6%.
That's a real, dose-dependent number — but it's about what a long hold does to your next set, not about what it does to your flexibility. We cover the before-or-after question properly in stretch before or after your workout. If you're stretching purely to become more flexible over time, this doesn't apply to you at all.
What stretching won't do
Two claims get attached to stretching that the evidence doesn't support:
It won't meaningfully reduce soreness. A Cochrane review (CD004577.pub3) pooling 12 trials — including one with over 2,000 participants — concluded that stretching, whether before, after, or both, "does not produce clinically important reductions in delayed-onset muscle soreness in healthy adults." The effect sizes were real but tiny: about half a point to four points on a 100-point soreness scale.
It won't prevent injury. The same Behm et al. 2016 review found static and PNF stretching had "no clear effect on all-cause or overuse injuries." If someone tells you stretching before a run will keep you injury-free, the data doesn't back that up either way.
None of that means stretching is pointless — it means it's not doing the jobs people hand it. It's doing a different job: improving range of motion, gradually, with consistent practice.
Does sex matter?
The same meta-analysis found females showed greater range-of-motion gains than males from the same stretching stimulus. That's a finding in the data, not a training recommendation — nothing in the research says either sex should stretch differently because of it, so we'll leave it there.
So what should you actually do?
Pick a style you'll stick with — static or PNF over ballistic if long-term range of motion is the goal — hold each stretch for however long feels reasonably challenging without straining, and do it often enough that it becomes a habit rather than an event. The exact count you land on matters far less than whether you're still doing it in six weeks.
That's the whole case for building stretching into something you don't have to think about, rather than a number you have to hit.
Try fitn3s: a cool-down that doesn't ask you to count
fitn3s includes a free cool-down — 3 to 8 poses, offered after any workout, as many times a day as you want, no timer to watch. Here's how flexibility and strength training fit in one plan — stretching because it's built into the routine, not because you're chasing a stopwatch.
It's free, takes a few minutes, and needs no equipment.
Try fitn3s free →Looking for more? Read whether you should stretch before or after your workout, test your plank or wall-sit hold, or see how progressive overload works without weights.