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However, if you lack flexibility in your calves, hamstrings and lower back, you're better off performing this stretch while seated in a chair. 1  Sit upright in a chair; keep your spine straight and your head held erect above your shoulders. 2  Place your palms in your lap. Relax your shoulders and arms.
Stretch out your hamstring. If you have a cramp on the back of your thigh, stretch out your hamstring. There are different ways to stretch the hamstring that may help alleviate the cramp. Using a towel or belt, lay flat on the ground and raise the affected leg.