Lie on your back with both of your legs straight.
Bend the leg that you would like to stretch and bring your knee in towards your chest.
Clasp your hands together behind your thigh.
Allow your thigh to rest in your hands with your arms straightened.
Keeping your upper body relaxed, slowly straighten your knee, bringing your foot up towards the ceiling.
Hold the position when you feel a stretch at the back of your thigh.
To ease off the stretch, bend your knee again.
Repeat.