The Hamstring is a collective three muscles situated between the ischial tuberosity (lower portion of the pelvic 'goggles')and the tibia and fibula (lower leg bones just below the knee).
This collective cross two joints, the hip and knee.
These attachments mean the main movements they provide are bending of
the knee, and extension of the hip (pulling of the thigh backwards).
Hamstrings play a crucial role in many daily activities, such as,
walking, running, jumping, and controlling some movement in the trunk.
In walking, they are most important as an antagonist to the quadriceps
in the deceleration of knee extension.
The Hamstrings plays an
essential role in characterizing body flexibility, making it an
important muscle to maintain via stretching and exercising.