Can't Touch Your Toes? Hamstring Mobility Exercises and How Often to Do Them
Short answer: yes, regular stretching moves your hamstrings, and it takes less time than you think. Across 79 randomised trials in healthy people, static stretching programmes produced a moderate improvement in lower-limb range of motion. A second review of 189 studies put a number on the dose: gains were maximised at about 10 minutes of total stretching a week, and doing more added nothing measurable. How you split those minutes didn't change the result.
If you sit on the floor with your legs out in front and your lower back rounds into a C, this is for you. Same if your forward fold stops at your shins and your hands hover there like they're waiting for a lift.
Below: what the two biggest reviews of static stretching measured, the weekly dose they landed on, and a plan that fits inside the time you already spend scrolling.
Why your back rounds when you sit with your legs out
This bit is coaching, not research. Your hamstrings run from your sit bones down past the back of the knee. When they've got no slack, your pelvis can't tip forward over your legs, so your spine does the folding instead. That's the rounded back.
The fix is giving the hamstrings enough range that the pelvis can tip. The research below is about how much stretching that takes.
What the stretching research measured
A 2026 systematic review and meta-analysis in Sports Medicine - Open pulled together 79 randomised controlled trials, 3,287 people in total, all healthy, from children to adults over 65. Every trial ran a static stretching programme of at least two weeks on a lower-limb muscle group and compared it with not stretching. They measured flexibility as angles and distances: straight-leg raise, knee extension, sit-and-reach. (Oba 2026.)
Static stretching worked. The pooled improvement was a Hedges' g of 0.851, which the authors rate as moderate. The hamstrings were the most studied muscle, 47 of the 79 trials, and their figure came in at 0.995, the largest of the three muscle groups, though the gap between muscle groups was not statistically significant. (Oba 2026.)
The part I find most useful is what didn't matter. Age, sex, training status, whether people started out tight, and which muscle was stretched: none of them changed the size of the gain in any significant way. Sedentary people improved, and so did athletes, and so did adults over 65. (Oba 2026.)
Two honest caveats from the authors. The trials varied a lot in how they were run, so the individual results scattered a fair way around that average, and there were signs that small studies with big results were over-represented. The finding held when they checked for that. (Oba 2026.)
How often should you stretch?
A 2025 review in Sports Medicine is the best answer I've found. It pooled 189 studies and 6,654 adults, average age 27, then ran a meta-regression to find the dose that produced the most range. (Ingram 2025.)
The headline: gains from a stretching programme were maximised at a cumulative 10 minutes a week, and doing more than that added nothing measurable. For a single session, the range you gain on the spot topped out at 4 minutes of stretching. (Ingram 2025.)
Then the list of things that didn't change the outcome: how hard you pushed the stretch, how many sessions a week you spread it across, and how many weeks the programme ran. Age, sex and training status made no difference either. (Ingram 2025.)
Two things did. Adults who started with poor flexibility improved more than adults who started average, and in the single-session data the hamstrings responded more than the spine. If you can't reach your toes, you're in the group with the most to gain. (Ingram 2025.)
The dose, in one table
Everything in it comes from the two reviews.
| The question | What the reviews found | Source |
|---|---|---|
| How long per session? | Range gained from a single session topped out at 4 minutes of total stretching | Ingram 2025 |
| How much per week? | Gains from a programme were maximised at 10 minutes of total stretching a week; more added no measurable benefit | Ingram 2025 |
| How many days a week? | Weekly session frequency did not change the size of the improvement | Ingram 2025 |
| How hard? | Stretch intensity did not change the size of the improvement | Ingram 2025 |
| For how many weeks? | Programme length did not change the size of the improvement; the randomised trials in the other review all ran two weeks or longer | Ingram 2025; Oba 2026 |
| What changed? | Range of motion. Hedges' g 0.96 for stretching programmes (the chronic estimate in a 189-study review); 0.851 across 79 randomised trials in healthy people; 0.995 for the hamstrings specifically, numerically the largest muscle group but not a significant difference (p = 0.10) | Ingram 2025; Oba 2026 |
| Who gained most? | Adults with poor starting flexibility. Age, sex and training status made no significant difference | Ingram 2025; Oba 2026 |
A note on the numbers. Ingram's team call 0.96 large and Oba's call 0.851 moderate. They use different cut-offs, and the figures sit close together. Either way, the change is big enough to measure with a tape.
A week that fits the numbers
Here's how I'd spend the 10 minutes. This is coaching, not a trial protocol.
Pick two hamstring stretches you can do without equipment: a standing forward fold with soft knees, lying on your back with one leg up and a towel around the foot, or a seated single-leg reach with the other knee bent and your back long rather than round.
Split the 10 minutes however your week allows. Three sessions of three or four minutes, or five short ones, or two longer ones. The dose review counted total time under stretch, and how you divide it didn't change the result. (Ingram 2025.)
Go to the point of a firm stretch and hold. Pushing harder didn't buy more range in the review, so there's no prize for grimacing. (Ingram 2025.)
Then keep going. The reviewers found no programme length that outperformed another, so the goal is a habit you can keep rather than a heroic fortnight. (Ingram 2025.)
Why it feels worse the day after
Neither review measured day-to-day range, so I can't give you a citation for this one. What I can tell you is what we see on the floor.
Range wobbles from day to day. A big stretching session can leave you sore and cautious for a day or two, and a cold morning fold will never match a warm evening one. That's not range you've lost. The trials measured people over weeks, not mornings, and the weekly total is what produced the change.
To track progress, test once a week at the same time of day, after the same warm-up, and ignore the rest.
Where this shows up on the wall
Hamstring range is not a vanity project for us. A seat drop, Level 1 on our progression card, is the sit-up-straight-with-legs-out position landed on a trampoline. A pike is a fold in the air, and frontflip pike sits at Level 3. The hamstrings have to give for both.
A guided session at Run The Wall runs 1 hour 45 minutes, adults only, in groups of up to four, and ends with a cooldown and stretch block. That stretch isn't the programme; the programme is the boring 10 minutes a week at home. The session is the reason to keep it up, because you get to watch your range turn into a shape.
New to all of this? Start with what a session looks like. For the same weekly-dose logic applied to bouncing, we did that too.
FAQ
How often should I stretch my hamstrings?
Aim for about 10 minutes of total stretching a week, split however suits you. In the dose review, gains were maximised at that weekly volume, and how many days you spread it over made no difference to the result. (Ingram 2025.)
Why is my flexibility worse the day after stretching?
The reviews didn't measure this, so treat what follows as coaching. Day-to-day range moves with soreness, warmth and time of day. Judge progress over weeks, because that's the timescale the research measured, and don't chase yesterday's number.
I'm in my 40s. Is it too late to get flexible?
Not according to the trials. Age didn't significantly change the size of the improvement in either review, and the healthy-people review included adults over 65 who improved by a similar margin to the young ones. (Oba 2026.) (Ingram 2025.)
My hamstrings are so tight it hurts. Should I push through?
No. Firm is enough, because pushing harder didn't add range in the dose review. (Ingram 2025.) And if the tightness comes with pain down the leg, numbness, a recent injury, or a condition you are managing, ask your GP or physio before you start any stretching programme, and tell the coach when you book.
Want a reason to keep stretching? Guided sessions at Run The Wall in Brookvale are adults-only, groups of up to four, and coached from warm-up to cooldown. Book a session, or build the rest of your week with low-impact strength training.
References
- Oba, K., Matsuo, S., Nakamura, M., Nakao, G., Fukaya, T., Mizuno, T., & Takeuchi, K. (2026). Moderating effects of individual characteristics and the target lower limb muscle group on flexibility adaptations to chronic static stretching in healthy individuals: a systematic review and meta-analysis of randomized controlled trials. Sports Medicine - Open, 12(1), 95. doi:10.1186/s40798-026-01066-1 (PMID 42435098)
- Ingram, L. A., Tomkinson, G. R., d'Unienville, N. M. A., Gower, B., Gleadhill, S., Boyle, T., & Bennett, H. (2025). Optimising the dose of static stretching to improve flexibility: a systematic review, meta-analysis and multivariate meta-regression. Sports Medicine, 55(3), 597-617. doi:10.1007/s40279-024-02143-9 (PMID 39614059)