One Leg Hamstring Roll-Ins

This is the harder version of the hamstring roll in. Performed on one leg! That is the joy of using the stability ball. You can make most exercises harder by decreasing what you have in contact with the ball or the floor. Take an arm off here or a leg off there and it will get trickier!

1) Lie on your back with your feet on the ball.
2) Lift your hips up off the floor and tighten your core muscles.
3) Now lift one foot off the ball and keep the leg in the air.
4) Roll the ball in towards your glutes using one leg only.
5) Push the ball away from you and straighten the leg out.

It is again important to keep the hips level when you are doing this. As you lift one leg off the ball it is natural for the hip to want to drop down on that side as it has lost its support. Keep strong through your midsection and keep the hip up.