FITBALL HAMSTRING CURLS One of the most troublesome muscles for my MS Gym members to feel and activate are the HAMSTRINGS. These muscles run down the back side of your upper leg and are responsible for bending your knees and extending your hip (think pushing off as your walk or standing up from a chair). The reason why the hamstrings are so difficult to activate is because they very often shut down by spasticity in the opposite muscle group to them – your quadriceps (thigh muscles). During exten