Well, to be honest, now that I think about it, I don't know how it would work your glutes and hamstrings either. It worked the front of my legs (the quads) but that's all. That's why I thought it was lame. When I completed the workout (it was about 32 minutes long), I asked myself where was this new twist to the leg press, and did I miss something? I didn't get too much benefit from this workout and ended up selling it on the Ya Ya swap board.
In order to work your glutes and hamstrings without doing a leg press, the instructor in that video got on the floor on all 4's, and put an 8 lb. dumbbell behind one knee (or whatever weight you feel comfortable with), and lifted the leg up and down. When I workout, I do it in a carpeted room, so if your workout room isn't carpeted (or even if it IS carpeted) when you have to get down on all 4's, you might want to try it with knee pads, a mat, or a thick towel underneath.