I actually did pull throughs for the first time Friday and loved them! I intended for them to be a hammie excercise but the way I did them had my back pumped more. I could def. feel tension in my hamstrings at the bottom but I think they worked more of my back. I could not watch the video, so I do not know how he does them, but from what I have heard if you do them with bent legs it puts more pressure on the glutes and hammies. I did them with a wide stance and straight legs, but I will be doing them with a narrower stance and straight legs next time to try to get more leg/glute involvement.