Hip extension moments are the products of the gluteus maximus, hamstrings and adductor magnus muscle forces and their associated moment arm lengths. (strengthandconditioningresearch.com)
This may imply that hip extension movements operating at large degrees of hip flexion are more likely to require greater hamstring and adductor magnus involvement and less gluteus maximus involvement, while hip extension movements operating close to full hip extension are more likely to require greater gluteus maximus involvement. (strengthandconditioningresearch.com)
The hamstrings are the primary target, with the gluteus maximus and adductor magnus as the synergists and the erector spinae as the stabilizer. (verywellfit.com)