Why Is the Semitendinosus Important?

It allows the thigh to extend, tibia to rotate, and knee to flex. The semitendinosus muscle mainly consists of fast-twitch muscle fibers that contract rapidly for short periods.

What is semitendinosus used for?

The semitendinosus muscle collectively with the other two muscles of the posterior compartment of the thigh work to extend at the hip and flex at the knee. The semitendinosus muscle, in particular, has the added functionality of assisting the popliteus muscle in rotating the leg internally.

How does the semitendinosus work?

Knee Flexion

Step 1: Stand behind a chair, using the chair back to balance as you put your weight onto one foot. Step 2: Keeping the other foot flexed as you lift it up into the air behind you, bend your knee as you bring your foot toward your butt. The front of your leg should remain steady and straight.