Amazing for the rec fem but feels a little awkward on the hamstring curls more reminiscent of what you'd feel with standing hamstring curls. I think it gets the job done though. You can also train your hips via external/internal rotation by standing next to the apparatus and placing the inside or outside of your knee against the pad that you'd normally be resting your knee/quad on when doing hamstring curls, with your foot behind the roller. I should warn you though that it is obviously not designed for this purpose and that these two exercises greatly increase the risk of, for example, pinching your feet against the hold at the bottom and the developer itself or jerking the bench as you are not weighing it down by sitting on it, so extreme caution should be advised if you absolutely must train your hips this way.