Being one of the three muscles which comprise the hamstrings, the semitendinosus is found to the back of the upper leg and is noted as having a long tendon insertion.
As with the other hamstring muscles, the semitendinosus can be developed and strengthened with exercises which involve the flexion of the leg, as well as the extension of the hip. Popular leg flexion exercises are primary leg curling variations, such as the standing and seated leg curl. The hamstrings can be effectively targeted via hip extension with stiff leg deadlifts, traditional deadlifts and good mornings.
Strong hamstrings are important for a healthy and injury resistant knee joint.