Long head of biceps femoris
Thighs
- Origin
- Ischial tuberosity
- Insertion
- Head of the fibula
- Action
- Flexes the knee, extends the hip and laterally rotates the leg
- Nerve supply
- Tibial division of the sciatic nerve (L5–S2)
The outer hamstring that starts at the sit bone, so it crosses both the hip and the knee. Romanian deadlifts train its hip-extension role; leg curls train knee flexion.