Hamstring Stretch
Main muscle: Hamstrings
Mechanics type: isolation
Fitness level: beginner
Category: Stretching

  1. Lie on your back with one leg extended above you, with the hip at ninety degrees. Keep the other leg flat on the floor.
  2. Loop a belt, band, or rope over the ball of your foot. This will be your starting position.
  3. Pull on the belt to create tension in the calves and hamstrings. Hold this stretch for 10-30 seconds, and repeat with the other leg.

Source: bodybuilding.com