Dear Adarq and LanceSTS,
I am confused

on which exercise to use. I have been doing the weighted 1 legged hypers using my glutes as the prime mover.
http://www.youtube.com/watch?v=jh45myksaEsI have 2 questions:
1. Should I just switch to natural glute ham raise?
2. Should I do both, but use the lower back as the prime mover for the hyperextensions?