Seated Hamstring and Calf Stretch
Main muscle: Hamstrings
Other muscles: Calves
Fitness level: intermediate
Category: Stretching

  1. Loop a belt, rope, or band around one foot. Sit down with both legs extended . This will be your starting position.
  2. Leaning forward slightly, pull on the belt to draw the toes of your foot back. Hold this position for 10-20 seconds and then repeat with the other leg.

Source: bodybuilding.com