TL;DR
- Hold about 30 seconds: better than 15 seconds and as good as 60 in randomised trials on tight hamstrings.[1][2]
- Keep the back straight and hinge at the hip: the stretch should be felt behind the thigh, not in the lower back.
- Static or PNF beats bouncing: both produced larger long-term range gains than ballistic or dynamic stretching.[4]
- For injury prevention, train eccentric strength: Nordic hamstring curls roughly halved hamstring injuries; stretching alone did not prevent injuries.[5][6]
How do you stretch your hamstrings? Straighten one leg in front of you, keep your back flat and hinge forward from the hips until you feel a stretch behind the thigh, then hold for about 30 seconds. In randomised trials, 30-second holds done 5 days a week for 6 weeks improved hamstring flexibility more than shorter holds and as much as longer ones.[1][2]
The hamstrings run from the sit bones to below the knee and cross both joints, so they are stretched by bending at the hip with the knee straight. Runners load them hard in the late swing phase, and lifters lengthen them under load in Romanian deadlifts and good mornings. Rounding the lower back to reach further mostly moves the spine, not the hamstrings.
Which hamstring stretches work best?
| Stretch | How to do it | Good for |
|---|---|---|
| Lying strap stretch | On your back, loop a strap or towel round one foot and raise the straight leg until you feel the stretch; keep the other leg flat. | Beginners and anyone with a sensitive back |
| Standing hip hinge | Heel on a low step, knee straight, spine long; push the hips back and lean the chest forward. | Runners before or after a run |
| Seated single-leg stretch | Sit tall, one leg straight, and fold forward from the hips rather than rounding. | Daily routines |
| Contract-relax (PNF) | In the strap position, press the heel into the strap for about 5 seconds, relax, then take up the new range. | Faster range gains |
A systematic review of 28 hamstring trials found that every stretching method improved range of motion; study quality was too low to name a single best technique.[3] A larger 2024 meta-analysis found static and PNF stretching beat ballistic or dynamic stretching for long-term range.[4]
How long and how often should you stretch your hamstrings?
Bandy and Irion compared 15, 30 and 60-second daily holds for 6 weeks in people with tight hamstrings: 30 and 60 seconds beat 15, and 60 added nothing over 30.[1] A follow-up trial in 93 people found no extra benefit from 60-second holds or from stretching three times a day; one 30-second hold, 5 days a week, was enough to gain range.[2] The 2024 meta-analysis found no clear winner among volumes or frequencies, so consistency matters more than an exact recipe.[4]
Does stretching prevent hamstring strains?
Not on its own. In a meta-analysis of 25 trials with 26,610 participants, stretching showed no injury-prevention effect (risk ratio 0.963), while strength training cut injuries markedly (risk ratio 0.315).[6] For hamstrings specifically, programmes that included the Nordic hamstring exercise reduced hamstring injuries by about half (risk ratio 0.49) across 15 studies and 8,459 athletes.[5] If you sprint or play field sports, add Nordic curls and keep stretching for range of motion.
What should lifters and runners do differently?
- Lifters: Romanian deadlifts and good mornings through a full, controlled range build hamstring length under load; resistance training improved range of motion about as much as stretching in a 2023 meta-analysis.[8] Use static holds where range still limits your hinge.
- Runners: use leg swings and a few short dynamic hinges before a run, then two 30-second holds per leg afterwards. Save long static holds for after sessions; the 10-minute routine sets this out.
How do you track hamstring flexibility?
A sit-and-reach test is a practical marker: it correlates moderately with hamstring flexibility and poorly with lower-back flexibility.[7] Rate your score against Canadian norms with the Flexibility Score Calculator and retest every 4-6 weeks under the same conditions. For the front of the hip, see how to stretch hip flexors.
Frequently asked questions
How long should you hold a hamstring stretch?
About 30 seconds. In two randomised trials on people with tight hamstrings, 30-second holds improved range of motion more than 15-second holds and as much as 60-second holds or several holds a day.[1][2]
How often should you stretch your hamstrings?
The classic trials used 5 days a week for 6 weeks, which produced clear gains.[2] A 2024 meta-analysis found no single frequency that clearly beat the others, so pick a schedule you can keep, at least two or three days a week.[4]
Does stretching prevent hamstring injuries?
Not on the best evidence. Stretching showed no injury-prevention effect across 25 trials,[6] while programmes that included the Nordic hamstring exercise roughly halved hamstring injury rates in a meta-analysis of 8,459 athletes.[5]
Is the sit-and-reach test a good hamstring test?
A reasonable one. Sit-and-reach scores correlate moderately with hamstring flexibility (corrected r 0.46-0.67) and poorly with lower-back flexibility.[7] Repeat the same test every few weeks to track change.
References
- 1 The effect of time on static stretch on the flexibility of the hamstring muscles (Bandy, Irion) — Physical Therapy, 74(9):845-850 (1994)
- 2 The effect of time and frequency of static stretching on flexibility of the hamstring muscles (Bandy, Irion, Briggler) — Physical Therapy, 77(10):1090-1096 (1997)
- 3 The effects of hamstring stretching on range of motion: a systematic literature review (Decoster, Cleland, Altieri, Russell) — Journal of Orthopaedic & Sports Physical Therapy, 35(6):377-387 (2005)
- 4 Chronic effects of stretching on range of motion with consideration of potential moderating variables: a systematic review with meta-analysis (Konrad et al.) — Journal of Sport and Health Science, 13(2):186-194 (2024)
- 5 Including the Nordic hamstring exercise in injury prevention programmes halves the rate of hamstring injuries: a systematic review and meta-analysis of 8459 athletes (van Dyk, Behan, Whiteley) — British Journal of Sports Medicine, 53(21):1362-1370 (2019)
- 6 The effectiveness of exercise interventions to prevent sports injuries: a systematic review and meta-analysis of randomised controlled trials (Lauersen, Bertelsen, Andersen) — British Journal of Sports Medicine, 48(11):871-877 (2014)
- 7 Criterion-related validity of sit-and-reach tests for estimating hamstring and lumbar extensibility: a meta-analysis (Mayorga-Vega, Merino-Marban, Viciana) — Journal of Sports Science and Medicine, 13(1):1-14 (2014)
- 8 Resistance Training Induces Improvements in Range of Motion: A Systematic Review and Meta-Analysis (Alizadeh et al.) — Sports Medicine, 53(3):707-722 (2023)