Hamstring Strain: Grades, Recovery Time and Rehab Exercises

01Anatomy

What are the hamstrings?

The hamstrings consist of the biceps femoris, semitendinosus and semimembranosus. They start at the sitting bone (ischial tuberosity), run down the back of the thigh and cross the hip and the knee, which means they extend the hip and bend the knee, and also decelerate the leg during running. Because they work across two joints and contract forcefully while lengthening during the late swing phase of sprinting, they are particularly vulnerable.

02Symptoms

Symptoms

• Sudden sharp pain at the back of the thigh, sometimes with a “pop” or tearing sensation.
• Pain on walking, bending the knee against resistance or stretching.
• Tenderness, swelling and bruising that may appear and spread down the back of the leg after a day or two.
• Muscle spasm and weakness.
• Pain when sitting, particularly in injuries near the sitting bone.

03Grades

Grades of hamstring strain

• Grade 1 (mild): overstretched fibres, minor pain and tightness; able to walk; recovery of 1–3 weeks.
• Grade 2 (moderate): partial tear with pain, swelling, bruising and weakness; limp; recovery of 4–8 weeks.
• Grade 3 (severe): complete rupture of the muscle or tendon, or avulsion from the bone; severe pain, big bruise and loss of function; months, with possible surgery for avulsion.
• Injuries near the sitting bone (proximal tendon) and the central tendon take longer than injuries within the muscle belly.

04Causes

Causes and risk factors

• Sprinting and rapid acceleration; kicking; sudden stretching, such as slipping.
• Previous hamstring injury (the strongest risk factor).
• Fatigue, inadequate warm-up and sudden increases in training load.
• Lack of eccentric hamstring strength, and imbalances with the quadriceps.
• Age, poor flexibility and lower-back or pelvic factors in some people.

05First days

First days: PEACE

• Protect: avoid activities that increase pain for 1–3 days; walk with a short stride; crutches only if you cannot walk without a limp.
• Elevate the leg when resting, and apply light compression if it eases swelling.
• Avoid anti-inflammatory tablets in the first days if possible, and avoid heat, massage or alcohol, which may increase bleeding. Paracetamol is fine for pain.
• Compress and Educate: understand that rest is brief and active recovery is the goal.
• Start gentle pain-free movement and isometric holds as early as day 2–3.

06Rehab

Rehabilitation exercises (LOVE)

• Phase 1 (days 2–7): isometric hamstring holds (press the heel into the floor or a bed with the knee slightly bent, 5 × 30 seconds), gentle walking, glute activation.
• Phase 2 (weeks 1–3): double-leg glute bridge 3 × 12, progressing to single-leg bridge; hamstring curls with a band or machine 3 × 10; hip hinge or Romanian deadlift with light load.
• Phase 3 (weeks 3–6): Nordic hamstring curls (start with partial range, 2 × 5), single-leg Romanian deadlift, stationary bike and jogging progression.
• Phase 4 (weeks 5–10): running drills, strides and acceleration, and then sprint-specific and sport-specific work.
• Pain should stay at 3/10 or below during exercise and settle within 24 hours. Progress only when you can do the current phase comfortably.

07Return

Return to sport

You are generally ready to return when you can walk, jog and run at increasing speeds without pain, have near-equal strength and range of motion compared to the other leg, and can tolerate sport-specific drills including sprinting and sudden changes in direction. Most athletes return after 3–8 weeks, depending on the grade and the location. Rushing back is the main cause of re-injury, which is common in the first few weeks after returning.

08Prevent

Preventing re-injury

• Continue strengthening after returning: Nordic curls and hip hinges once or twice weekly reduce injury risk.
• Warm up properly with dynamic drills and progressive sprints.
• Build training load gradually; avoid sudden jumps in intensity or volume.
• Manage fatigue and allow recovery between hard sessions.
• Address hip, trunk and calf strength.
• Include some mobility work for hamstrings and hip flexors.

10Cases

Three common situations

A footballer feels a tightness while sprinting but can continue to walk: likely grade 1; relative rest, early isometrics and gradual return.

A runner with a sudden pop at the sitting bone and a large bruise: seek assessment for proximal tear.

A recreational athlete with repeated hamstring pulls: work on eccentric strength, running mechanics and training load.

11Summary

Key points to remember

Hamstring strains heal well with a short period of protection followed by progressive loading. Do not skip strengthening, return gradually and keep up preventive exercises. Seek help for severe pain, a pop, big bruising or lack of improvement.

This guide is for general information and does not replace an assessment by your own doctor or physical therapist.