What is the Quadratus Femoris?
The quadratus femoris is a small, deep muscle in the back of your hip. It sits underneath the larger glute muscles and close to other deep hip rotators. It runs from a bony point on your pelvis called the ischial tuberosity, which is basically the “sit bone,” to the upper part of your thigh bone near the hip joint. Because it’s short and tucked away, you won’t see it from the outside, but it plays an important role in how your hips move and how stable you feel during training.