Seated Single Hamstring Stretch
In the seated single hamstring stretch you extend one leg along the floor, keep the other foot tucked in, and hinge forward from the hips over the straight leg. Working one leg at a time lets tighter runners and lifters give each hamstring its own dose instead of letting the looser side steal the range. Coached by Maddy (NASM-CPT) — these are the exact form cues he gives on every client's first week.
Muscles worked
Sets & reps by goal
| Goal | Sets × Reps | Rest |
|---|---|---|
| Strength | 2 × 15–20 s hold per leg | 10–15 s between holds |
| Muscle | 2–3 × 20–30 s hold per leg | 10–15 s between holds |
| Endurance | 3 × 30–45 s hold per leg | 10–15 s between holds |
Level — Beginner
Beginner level — the bent-knee tuck lets even very tight athletes find a workable starting position.
Proper form — 5 cues
- Sit with one leg long, toes pointing at the ceiling
- Tuck the other foot against the inner thigh of the straight leg
- Hinge from the hips, sliding the chest toward the extended knee
- Keep the spine long — lead with the sternum, not the forehead
- Rest the hands on the shin or thigh wherever they land without rounding
Breathing: Inhale to lengthen the spine, exhale as you hinge a little further over the leg.
The 3 mistakes Maddy corrects most
How to program seated single hamstring stretch
| Goal | Phase | Sets | Reps | Tempo | Rest | RPE |
|---|---|---|---|---|---|---|
| strength | weeks 1–4 · pre-lift primer | 2 | 15 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3–4/10 stretch intensity, never pain |
| strength | weeks 5–8 · pre-lift primer | 2 | 18 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3–4/10 stretch intensity, never pain |
| strength | weeks 9–12 · pre-lift primer | 2 | 20 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3–4/10 stretch intensity, never pain |
| hypertrophy | weeks 1–4 · post-lift reset | 2 | 20 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3–4/10 stretch intensity, never pain |
| hypertrophy | weeks 5–8 · post-lift reset | 2 | 25 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3–4/10 stretch intensity, never pain |
| hypertrophy | weeks 9–12 · post-lift reset | 3 | 30 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3–4/10 stretch intensity, never pain |
| endurance | weeks 1–4 · mobility block | 3 | 30 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3–4/10 stretch intensity, never pain |
| endurance | weeks 5–8 · mobility block | 3 | 38 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3–4/10 stretch intensity, never pain |
| endurance | weeks 9–12 · mobility block | 3 | 45 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3–4/10 stretch intensity, never pain |
| beginner | weeks 1–4 · learn the position | 1 | 15 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 2–3/10, gentle |
| beginner | weeks 5–8 · daily habit | 2 | 15 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 2–3/10, gentle |
| beginner | weeks 9–12 · longer holds | 2 | 15 s hold per leg | ease in 2 s · hold · ease out 2 s | 10–15 s between holds | 3/10, gentle |
Tempo = eccentric-pause-concentric-pause, seconds; stretch rows use ease-in/hold/ease-out.
Common questions
Why stretch one hamstring at a time instead of both together?
Almost nobody is symmetric. In a two-leg forward fold the more flexible side absorbs the range and the tight side hides. Stretching one leg at a time forces each hamstring to take its own stretch, and you can hold the tight side a little longer to gradually close the gap between the two.
I feel this behind my knee, not in my hamstring — is that wrong?
Sensation behind the knee usually means the calf and the tissue crossing the joint are picking up the stretch, often because the toes are pulled hard toward you. Soften the ankle, bend the knee a few degrees, and re-hinge from the hips — the feeling should migrate up into the muscle belly of the thigh.
How long until hamstring flexibility improves?
With holds most days of the week, many people notice easier reach within a few weeks, though the pace varies with training history and how much of the day you spend seated. Treat it like any other training: small consistent doses, no forcing, and re-test something measurable — like fingertip-to-shin distance — every couple of weeks.
Should I round my back to reach further in the seated hamstring stretch?
No — rounding is the most common way this stretch gets faked. Folding the spine lets your hands travel closer to your toes while the hamstrings barely lengthen, so you feel busy but change nothing. Instead, sit tall, hinge from the hips and lead with your chest toward the extended leg; you will not reach as far, and that is the point. A small, honest hip hinge that you feel in the back of the thigh beats a deep rounded fold every time.
Is it better to stretch my hamstrings before or after leg day?
Save the long holds for after training or for rest days, when warm muscles let you relax into the position. Right before heavy squats or deadlifts, keep hamstring holds short — around 15 seconds — or use dynamic leg swings instead, since research suggests very long static holds immediately before lifting can slightly and temporarily blunt force output. The practical rule: brief and gentle before you lift, longer and deeper once the work is done.
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