Semitendinosus Muscle

When running the hamstrings act eccentrically to slow down the knee extension motion. Hamstring strains are common in individuals with chronically tight hamstrings or who do not warm-up thoroughly.

Origin : Ischial tuberosity.

Insertion : Upper medial surface of the tibia.

Actions : Hip extension.
Knee flexion.
Internal rotation of the hip when the knee is flexed.

Innervation : Tibial part of the sciatic nerve.

Daily uses : Bending the knee to step over something.

Example strengthening exercises : Knee curl with resistance band.
Nordic curl.

Example stretches : Sitting hamstring stretch.
Standing hamstring stretch.