In human anatomy, the hip flexors are a group of skeletal muscles that act to flex the femur (thigh bone) onto the lumbo-pelvic complex, i.e., pull the knee upward. The hip flexors are (in descending order of importance to the action of flexing the hip joint): Without the iliopsoas muscles, flexion in sitting position is not possible across the horizontal plane. Muscles that act as hip flexors frequently perform other actions. Due to this, they can be strengthened with movements besides those involving hip flexion, and stretched with movements that do not involve hip extension (or hyper extension). Awareness of these actions allows trainers to modify flexion/extension movements/stretches to modify the work done and emphasize different hip flexor muscles Examples include:
Contributions by Arcadian, Dictabeard, and 22.214.171.124.