Lying Hamstring
Also works: Calves
A partner-assisted contract-relax stretch for the hamstrings. You lie on your back, your partner holds one raised leg, you push against them for 10-20 seconds, then relax and let them ease the leg further. The isometric contraction is what buys the extra range — without it this is just someone leaning on your leg.
Own the movement
Set up first, then execute. Every cue below is something you can check on your next set.
Before the first rep
- Lie flat on your back with both legs extended and the back of your head on the floor.
- Your partner kneels beside your hip on the working side, facing you.
- Raise one leg toward the ceiling with the knee locked; your partner takes the ankle in both hands.
- For a heavier leg, your partner can brace it against their shoulder rather than holding it out at arm's length.
- Agree the signals before you start: one word for 'further', one word for 'stop'. Do not improvise this mid-stretch.
Every rep
Breathing & tempo — Breathe through the contraction rather than bracing against a held breath. Exhale fully as you release, and let your partner move the leg on that exhale — that is when the muscle actually gives.
Before you load it
- Skip this on a hamstring that has been strained in the last several weeks. A forced end-range position on healing tissue is exactly how a partial tear becomes a full one.
- Stop immediately if the sensation turns electric or shoots into the calf. That is sciatic tension, and a partner pushing further makes it worse rather than better.
How much, how often
Where to start, and what to change when it stops being hard.
No equipment beyond a willing partner. Two to three contract-relax cycles per leg: 10-20 seconds of pushing at 50-70% effort, then 15-20 seconds in the new range. Once or twice a week is plenty — this pushes range harder than daily solo stretching and needs recovery time between doses. If a session leaves the hamstrings sore the next day, you went too far.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Wait for one full exhale from the person being stretched, then advance slowly over three or four seconds. Moving into a hamstring that is still firing is the main way this drill causes a strain.
Push at roughly half to two-thirds effort. Maximal contraction at end range loads a lengthened hamstring hard and adds nothing to the range gained afterwards.
Call out at the first point of real tension every single cycle. Your partner has no feedback from your tissue — you are the only sensor in the system.
The partner puts a hand or knee across the down thigh to keep it pinned, and stops advancing when it starts to rise. A lifting down leg means the range is now coming from the pelvis.
The partner supports at the ankle and watches the knee, backing off the moment it softens. A bent knee slackens the hamstring, so the extra height is bought with nothing.
Why bother
Contracting a muscle hard at end range and then relaxing it leaves it briefly more willing to lengthen. The old explanation was autogenic inhibition through the Golgi tendon organs; the current one leans more on a short-term shift in stretch tolerance. Either way the effect is real and reproducible — one contract-relax cycle typically opens more range than a plain hold of the same length.
A partner supplies what you cannot supply yourself: something immovable to push against, and a second pair of hands to advance the leg while your own hip flexors stay switched off. That is also the risk. Your partner cannot feel your end range, so the drill lives or dies on you talking, out loud, about where the limit is.
Where it fits
After training, never before it — the contraction plus end-range hold is a poor state to walk into a heavy set from. Two or three contract-relax cycles per leg, once or twice a week, is enough. This is a periodic range-pushing tool; the daily maintenance work should be a solo stretch you can do without booking a partner.
If this one isn't it
No kit, too hard, or too easy — here's where to go instead.
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Asked and answered
Is contract-relax actually better than just holding a stretch?
For a single session, yes — the research fairly consistently shows PNF techniques open more immediate range than a passive hold of equal duration. Whether that translates into more long-term range is less clear, because long-term gains track total weekly exposure more than technique. Use contract-relax when you have a partner, and do not feel short-changed doing solo holds the rest of the week.
How hard should I push against my partner?
Half to two-thirds of what you could produce. The inhibition effect does not scale with effort, but the injury risk does — you are contracting a hamstring at its longest position, which is the same position it tears in. A comfortable, sustained push for 15 seconds is the target, not a one-second maximal shove.
Can I do this alone with a band or a doorway?
You can approximate it. Loop a strap over the foot, take the leg to tension, push the heel down into the strap for 15 seconds, then relax and pull further. You lose the immovable resistance and the second pair of hands, so the contraction is weaker and the advance is clumsier — but it captures most of the effect without needing to arrange a partner.
How do I brief a partner who has never done this?
Three rules: hold the leg still while I push, wait for my exhale before you move it, and stop the second I say stop. Tell them not to bounce and not to lean their bodyweight in. Most partner-stretching problems come from an enthusiastic helper who thinks more pressure means more benefit.