* Glutes (Gluteus Maximus, Medius, and Minimus): These muscles in the buttocks are stretched as the hip is flexed.
* Hamstrings: Located on the back of the thigh, the hamstrings are also stretched by hip flexion and the slight knee flexion involved in this stretch.
* Lower Back (Erector Spinae): While not stretched as directly as the glutes and hamstrings, the lower back muscles experience a gentle stretch as the pelvis tilts and the lumbar spine flattens.