Hi Andrew,

I read in your post on core traning  http://www.malepatternfitness.com/2009/4/9/828999/weight-use-more-for-a-strong-core that you employ the Hyperextension to hit the glutes (and other muscles). When you do hyperextensions do you allow your back to round at the bottom?  I have beenslighyly rounding my back at the bottom without any problems, but I was wondering if this is a good idea long-term. I remember in the workouts you posted that you were adding some serious poundage to this movement.

Thanks,

Marc