What is the Semitendinosus?
The semitendinosus is one of the three hamstring muscles on the back of your thigh. It runs from the bottom part of your pelvis (the “sitting bone” area) down to the inner side of your upper shin bone, crossing both the hip and the knee. You can think of it as a long strap that helps you bend your knee and extend your hip, which is the motion of driving your leg backward.