I think its personal preference. I use underhand narrow grip, and my arms are right at my side pulling into my stomach ..
AKA TreeTrunkLegs
"I am the man responsible for who I am. When I look in the mirror each day, I stare my creator in the eyes. I am responsible for what I have and will become, I am accountable for what I will or will not accomplish. I believe in myself, I bow to no man and my only critic of any consequence has walked every mile of this journey in my size thirteens. " - G. Diesel