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?