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Thigh / hamstring · Acute Hamstring Strain

Hamstring Strain

You've strained (overstretched and partly torn) one of the hamstring muscles at the back of your thigh — the most common muscle injury in sprinting and kicking sports. Most strains are partial and heal well with the right exercises.

Hamstrings get injured either at high speed (the muscle is decelerating your shin and lengthening under big force) or in a slow extreme stretch (a kick, a split, a slide). The fix isn't rest and stretching — it's progressively loading the muscle into LENGTH, mainly eccentrically. That's what the Askling 'L-protocol' (Extender, Diver, Glider) does, and it returned athletes in about half the time of conventional treatment.

How it typically shows up

Sudden pain in the back of the thigh during high-speed running or a big stretch that forced you to stop, with localised muscle-belly tenderness and pain reproduced on a straight-leg raise — once a proximal avulsion off the sit-bone, nerve (sciatic) involvement, chronic proximal tendinopathy, groin/adductor strain, and back-referred pain are excluded.

How long recovery takes

Expect a step-by-step comeback over weeks: first calm it down and get it gently working, then strengthen it through a long, stretched-out range, then rebuild your running speed — and you move to the next stage when you're pain-free, not when the calendar says so.

One thing worth knowing: pain very high up near the sitting bone tends to mean a longer recovery and is worth getting a scan — lower down in the muscle belly usually recovers faster.

The phased recovery approach

  1. Phase 1 · 1–2 weeks

    Calm

    Calm the strain, restore pain-free walking, and start low-intensity isometric activation + lumbopelvic control. Avoid aggressive stretching.

    What you get back: walking without the catch.

    • Graded Walking — 1 sets × 300–900s hold · Build up your daily pain-free walking — a few minutes more each day as it allows
    • Supine Heel Slide / March — 2 sets × 8–12 reps · On your back, slowly slide one heel out and back, keeping the pelvis steady
    • Isometric Hamstring Bridge Hold — 2–3 sets × 10–20s hold · Lie on your back, heels on the floor, gently dig the heels down and lift the hips
    • Double-Leg Glute Bridge — 2–3 sets × 8–12 reps · Lie on your back, knees bent, feet flat — squeeze the glutes and lift the hips to a straight line from knee to shoulder

  2. Phase 2 · 2–5 weeks

    Rebuild

    The Askling L-protocol spine — load the hamstring into lengthening, mainly eccentrically (Extender → Diver → Glider) plus progressive strength and agility.

    What you get back: a strong, trustworthy stride.

    • The Extender (Askling L-1) — 2–3 sets × 10–12 reps · Hold the thigh of the injured leg with the hip flexed ~90°
    • Bodyweight Hip Hinge (RDL pattern) — 2–3 sets × 10–12 reps · Stand tall, push the hips back and let the chest tip forward, knees soft — feel a gentle stretch behind the thighs, then drive the hips through to stand
    • The Diver (Askling L-2) — 3 sets × 4–6 reps · Stand on the injured leg, hinge forward at the hip reaching the arms forward, lifting the other leg back, pelvis level
    • The Glider (Askling L-3) — 3 sets × 4–6 reps · All weight on the heel of the injured leg, knee ~10-20° bent, glide backward on the other leg

  3. Phase 3 · 1–2 weeks

    Jog and mechanics

    Reintroduce easy running exposure with mechanics drills and maintained hamstring strength before any speed work.

    What you get back: easy jogging with good mechanics.

    • The Glider (Askling L-3) — 2–3 sets × 4–6 reps · All weight on the heel of the injured leg, knee ~10-20° bent, glide backward on the other leg
    • Prone Hamstring Curl — 2–3 sets × 4–6 reps · Lie face down, slowly bend the knee to curl the heel toward the buttock and lower under control
    • Single-Leg Bridge — 2–3 sets × 4–6 reps · Bridge up on one leg, heel planted, keep the hips level
    • Bodyweight Hip Hinge (RDL pattern) — 2–3 sets × 8–10 reps · Stand tall, push the hips back and let the chest tip forward, knees soft — feel a gentle stretch behind the thighs, then drive the hips through to stand

  4. Phase 4 · 1–3 weeks

    Speed and strides

    Add controlled strides and accelerations after easy jogging is tolerated, while keeping eccentric strength in the plan.

    What you get back: faster strides without a grab.

    • The Glider (Askling L-3) — 2–3 sets × 5–8 reps · All weight on the heel of the injured leg, knee ~10-20° bent, glide backward on the other leg
    • Nordic Hamstring Lower (eccentric) — 2–3 sets × 5–8 reps · Kneel with the ankles anchored (or a partner holding), keep the body straight from knees to head
    • Prone Hamstring Curl — 2–3 sets × 5–8 reps · Lie face down, slowly bend the knee to curl the heel toward the buttock and lower under control
    • Single-Leg Bridge — 2–3 sets × 8–12 reps · Bridge up on one leg, heel planted, keep the hips level

  5. Phase 5 · 2–6 weeks

    Plyo and agility return

    Finish return-to-running with full-speed exposure, plyometric spring, and change-of-direction agility after the jog and stride phases are tolerated.

    What you get back: sprinting and sport again.

    • Nordic Hamstring Lower (eccentric) — 2–3 sets × 6–10 reps · Kneel with the ankles anchored (or a partner holding), keep the body straight from knees to head
    • The Glider (Askling L-3) — 2–3 sets × 6–10 reps · All weight on the heel of the injured leg, knee ~10-20° bent, glide backward on the other leg
    • Prone Hamstring Curl — 2–3 sets × 6–10 reps · Lie face down, slowly bend the knee to curl the heel toward the buttock and lower under control
    • Single-Leg Bridge — 2–3 sets × 8–12 reps · Bridge up on one leg, heel planted, keep the hips level

  6. Phase 6 · 1–3 weeks

    Back to daily life

    Lock in the hamstring strength and posterior-chain control that keep walking, bending, and stairs painless — a non-impact maintenance routine for everyday life.

    What you get back: walking, bending and stairs without the catch.

    • Graded Walking — 1 sets × 600–1800s hold · Build up your daily pain-free walking — a few minutes more each day as it allows
    • The Diver (Askling L-2) — 2–3 sets × 8–12 reps · Stand on the injured leg, hinge forward at the hip reaching the arms forward, lifting the other leg back, pelvis level
    • The Glider (Askling L-3) — 2–3 sets × 8–12 reps · All weight on the heel of the injured leg, knee ~10-20° bent, glide backward on the other leg
    • Prone Hamstring Curl — 2–3 sets × 8–12 reps · Lie face down, slowly bend the knee to curl the heel toward the buttock and lower under control

  7. Phase 7 · 3–6 weeks

    Back to the gym

    Rebuild heavy hip-hinge, deadlift and hamstring-curl tolerance for lower-body lifting without re-straining the hamstring.

    What you get back: deadlifting and lifting again.

    • Nordic Hamstring Lower (eccentric) — 3 sets × 6–10 reps · Kneel with the ankles anchored (or a partner holding), keep the body straight from knees to head
    • The Glider (Askling L-3) — 3 sets × 6–10 reps · All weight on the heel of the injured leg, knee ~10-20° bent, glide backward on the other leg
    • Machine Hamstring Curl — 3 sets × 8–12 reps · Set the pad just above the heels, curl the weight by bending the knees, then lower it slowly under control
    • Prone Hamstring Curl — 3 sets × 8–12 reps · Lie face down, slowly bend the knee to curl the heel toward the buttock and lower under control

Exact exercises, sets and progression depend on your severity, equipment and goal — this is the shape of the program, not a one-size prescription.

What matters while you recover

  • Load it into length — don't yank it

    It's tempting to stretch a tight hamstring hard, but aggressive early stretching can disrupt the healing tissue. Instead, load the muscle into length in a controlled way — the Extender, Diver, and Glider — always stopping JUST BEFORE pain. That controlled lengthening, not static stretching, is what the fastest-recovery protocol used.

  • Keep it (almost) pain-free

    The landmark hamstring protocol was run completely PAIN-FREE — no pain or discomfort during the exercises, and no anti-inflammatory painkillers (they were banned, so you can feel the real signal). Newer evidence says allowing a little controlled discomfort up to about 4/10 that settles quickly is just as good. Either way: stop short of real pain, and never push through it. A muscle strain is NOT a tendon problem, so the more permissive 'some pain is fine' tendon rule does NOT apply here.

  • Where it hurts predicts your timeline

    Pain low in the muscle belly usually recovers faster. Pain very high up near the sitting bone (the proximal tendon) tends to mean a longer recovery and is worth getting imaged — and if that high pain came with a sudden pop, heavy bruising, and you can't sit, get it assessed urgently. Most strains, though, respond well and steadily to the loading program.

Common questions

Should I stretch it hard to loosen it?
No — aggressive stretching early can disrupt the healing scar. The Askling exercises load the muscle into length in a controlled way instead, always stopping just before pain.
How much pain is okay during the exercises?
Keep it essentially pain-free — that's how the landmark protocol was run. A little discomfort up to about 4/10 that settles quickly is acceptable per newer evidence, but never push into real pain, and don't mask it with anti-inflammatories.
Why does where it hurts matter so much?
Pain right up at the sitting bone (the proximal free tendon) predicts a much longer recovery and, with a sudden pop + bruising + can't-sit + weakness, can mean a tear that needs surgical assessment quickly.

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