Hamstring Curls
The muscles along the back of the thigh are your hamstrings. Lie flat on your stomach. Slowly bring your heels as close to your buttocks as you can, and hold that position. Do three sets of 15. You can also do this exercise standing while holding on to a chair. If this becomes easy, you can add ankle weights, slowly increasing the weight from 1 to 3 to 5 pounds.
