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Thigh / hamstring · Acute Hamstring Strain

Hamstring Strain

A hamstring strain overstretches or partly tears a muscle at the back of the thigh. It’s the most common muscle strain there is, and it comes from a fast stride or a sudden stretch. Most are partial and recover well.

Hamstrings injure during fast shin-deceleration and forceful lengthening, or slow extreme stretches such as kicks, splits and slides. Rest and stretching won’t fix it. Progressively load lengthened muscle, mainly during lowering. The Askling ‘L-protocol’ (Extender, Diver, Glider) does this, returning athletes in about half conventional treatment time.

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 localized 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.

The phased recovery approach

  1. Phase 1 · 1–2 weeks

    Calm

    Settle the hamstring down and get walking comfortable again before we start loading it. No aggressive stretching.

    What you get back: a calmer hamstring, moving gently again.

    • The Extender: 3 sets × 12 reps · Straighten only to the point just before pain, never into it. · Lie on your back, injured leg lifted, both hands behind that thigh.
    • Isometric Hamstring Bridge Hold: 3–4 sets × 20–30s hold · This is a calm activation, so stay pain-free. · Lie on your back, knees bent, heels planted on the floor.
    • Clamshell: 2 sets × 10–15 reps · Move slow and controlled and feel it in the side of the hip, pain-free. · Lie on your side with knees bent and stacked, heels together.
    • Bird-Dog: 2 sets × 8–10 reps · Move slowly with no arching or twisting. Control over range. · On all fours, slowly reach one arm forward and the opposite leg back.

  2. Phase 2 · 2–5 weeks

    Rebuild

    Strengthen your hamstring by loading through a long, stretched range.

    What you get back: a strong, trustworthy stride.

    • The Extender: 3 sets × 12 reps · Straighten only to the point just before pain, never into it. · Lie on your back, injured leg lifted, both hands behind that thigh.
    • The Diver: 3 sets × 6 reps · Dive slowly initially, slightly quicker weekly while pain-free. · Stand on your injured leg, knee bent 10 to 20 degrees.
    • The Glider: 3 sets × 4 reps · Glide slightly farther weekly, then faster, stopping before pain. · Hold a counter, stand on your injured leg, knee bent about 10 to 20 degrees, weight in that heel.
    • Eccentric Heel Slider: 3 sets × 6–8 reps · Slide out slowly and stop short of any pain. · Lie on your back on a smooth floor with your heels on a towel or a pair of socks, knees bent.

  3. Phase 3 · 1–14 weeks

    Your path from here

    This part depends on your goal. Your program follows one of these.

    • Running again

      6–14 weeks for this path

      1. Jogging form

        3–5 weeks

        Resume easy jogging with controlled running form before speed work.

        What you get back: easy jogging with good mechanics.

        • Walking Warm-Up: 1 set × 5–10 min of activity · Warm up every run, jogging only once your leg loosens. · Walk at an easy pace for a few minutes before you run.
        • The Glider: 3 sets × 4 reps · Glide slightly farther weekly, then faster, stopping before pain. · Hold a counter, stand on your injured leg, knee bent about 10 to 20 degrees, weight in that heel.
        • Single-Leg Eccentric Heel Slider: 3 sets × 4–6 reps · Slide out slowly on the one leg and stop short of any pain. · Lie on your back on a smooth floor, one heel on a towel or sock, other leg lifted.
        • Nordic Hamstring Lower: 3 sets × 4–6 reps · Resist lowering maximally slowly, staying pain-free. · Kneel on a folded towel, ankles hooked under a heavy couch or held by someone.
      2. Fast strides

        1–3 weeks

        Once easy jogging feels fine, add faster strides without grabbing pain.

        What you get back: faster strides without a grab.

        • Walking Warm-Up: 1 set × 5–10 min of activity · Warm up every run, jogging only once your leg loosens. · Walk at an easy pace for a few minutes before you run.
        • The Glider: 3 sets × 4 reps · Glide slightly farther weekly, then faster, stopping before pain. · Hold a counter, stand on your injured leg, knee bent about 10 to 20 degrees, weight in that heel.
        • Single-Leg Eccentric Heel Slider: 3 sets × 4–6 reps · Slide out slowly on the one leg and stop short of any pain. · Lie on your back on a smooth floor, one heel on a towel or sock, other leg lifted.
        • Nordic Hamstring Lower: 3 sets × 4–6 reps · Resist lowering maximally slowly, staying pain-free. · Kneel on a folded towel, ankles hooked under a heavy couch or held by someone.
      3. Fast running

        2–6 weeks

        Once jogging and strides feel easy, rebuild full-speed running and spring.

        What you get back: fast running again.

        • Walking Warm-Up: 1 set × 5–10 min of activity · Warm up every run, jogging only once your leg loosens. · Walk at an easy pace for a few minutes before you run.
        • The Glider: 3 sets × 4 reps · Glide slightly farther weekly, then faster, stopping before pain. · Hold a counter, stand on your injured leg, knee bent about 10 to 20 degrees, weight in that heel.
        • Single-Leg Eccentric Heel Slider: 3 sets × 4–6 reps · Slide out slowly on the one leg and stop short of any pain. · Lie on your back on a smooth floor, one heel on a towel or sock, other leg lifted.
        • Nordic Hamstring Lower: 3 sets × 4–6 reps · Resist lowering maximally slowly, staying pain-free. · Kneel on a folded towel, ankles hooked under a heavy couch or held by someone.

    • Gym training

      3–7 weeks for this path

      1. Gym

        3–7 weeks

        Rebuild heavy deadlifts and leg training without hamstring re-strains.

        What you get back: deadlifting and lifting again.

        • Nordic Hamstring Lower: 3 sets × 6–10 reps · Resist lowering maximally slowly, staying pain-free. · Kneel on a folded towel, ankles hooked under a heavy couch or held by someone.
        • The Glider: 3 sets × 6–10 reps · Glide slightly farther weekly, then faster, stopping before pain. · Hold a counter, stand on your injured leg, knee bent about 10 to 20 degrees, weight in that heel.
        • Machine Hamstring Curl: 3 sets × 8–12 reps · Stay pain-free, adding weight once sets stop feeling hard. · Set the pad just above the heels.
        • Single-Leg Bridge: 3 sets × 8–12 reps · Move slow and controlled through a pain-free range. · Lie on your back, one knee bent, heel planted, other leg lifted off the floor.

    • Just everyday life, pain-free

      1–3 weeks for this path

      1. Daily life

        1–3 weeks

        Maintain lasting strength for easy walking, bending, and single-leg loading.

        What you get back: walking, bending, and one-sided loads without the catch.

        • Graded Walking: 1 set × 25–30 min of activity · Walk comfortably, staying pain-free. · Walk on flat, even ground at a relaxed, pain-free pace.
        • The Diver: 3 sets × 6 reps · Dive slowly initially, slightly quicker weekly while pain-free. · Stand on your injured leg, knee bent 10 to 20 degrees.
        • The Glider: 3 sets × 6 reps · Glide slightly farther weekly, then faster, stopping before pain. · Hold a counter, stand on your injured leg, knee bent about 10 to 20 degrees, weight in that heel.
        • Single-Leg Bridge: 3 sets × 15–20 reps · Move slow and controlled through a pain-free range. · Lie on your back, one knee bent, heel planted, other leg lifted off the floor.

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

    Don’t hard-stretch a tight hamstring, that can disrupt the healing tissue. Load it into length instead, always stopping just before pain.

  • Keep it (almost) pain-free

    Exercises can sit at mild pain, the group allowed that came back stronger. Running and sprinting stay completely pain-free. Never dull the pain before a session.

  • Where it hurts predicts your timeline

    Pain low in the muscle heals faster. Pain high near the sitting bone takes longer, so progress that one more patiently. Most respond well and steadily to loading.

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 mild discomfort that settles quickly is acceptable per newer evidence, but never push into real pain, and don’t dull the pain before a session, because it is what tells you the dose is right.
Why does where it hurts matter so much?
Pain right up at the sitting bone predicts a longer recovery, so progress long-length loading and running more patiently than you would for pain lower in the muscle.

Go deeper

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