Definitions for "Hamstrings"
The group of 3 muscles on the back of the thigh that runs from the lower part of the pelvis to just below the knees. They allow you to bend your knees and, along with the "glutes" straighten your legs at the hips
The group of muscles at the back of the thigh, and their tendons.
the tendons of the muscles of the ham - i.e. of the back of the thigh - felt behind the knee when the leg is flexed against resistance (semimembranosus, semitendinosus and biceps femoris).