Benefits:

The single leg hamstring curl on a stability ball is a brutal move that will strengthen your hamstrings, glutes and core. The most important thing here is to press your hips high to start so that there is a straight line from your heel to your back before beginning. This is the next progression to a two leg hamstring curl on a stability ball and should be done only after you can complete the two leg curl for ten reps with ease.

How To:

1) Lie flat on back with legs extended and heels on the stability ball

2) Bridge up by pressing heels into the ball, squeezing the glutes and elevating the hips off the ground

3) Lift one leg off the stability ball

4) Keep hips up and begin to draw your heels in rolling the stability ball towards your body