Lie on a fitball facing down, it should be under your stomach. Your feet should be touching the floor and a wall behind you. Place your hands on either side of your hips. Retract your shoulder blade.
Keeping your lower back flat, start leaning forward slowly from the hips going down as much as possible while inhaling. Keep moving until you feel a good stretch in your hamstrings and then stop. Return to the starting position while you exhale.TIPS: The exercise key is quality over quantity. The trick is to perform the exercise using proper form.