
Box Jump (Multiple Response)
Hamstrings


Legs / Beginner / Compound (multi-joint)
An explosive bodyweight exercise for the hamstrings, with the hip abductors, adductors and calves assisting.
Loads the knee. Use a load you can control and skip it if it causes pain.
Why it hurts: Rigid or valgus landings load the ACL and the patellar and Achilles tendons.
✓ Instead: Land softly on the balls of the feet with knees over toes and hips back. Master landings before adding height.
Why it hurts: Tendons adapt more slowly than muscles; high volume leads to tendinopathy (jumper's knee, Achilles).
✓ Instead: Start with about 40–60 foot contacts per session, twice a week, and build slowly. Leave 48 hours between sessions.
How specific this exercise is to each movement.
Photos and instructions: free-exercise-db (github.com/yuhonas/free-exercise-db), public domain.