Today I was doing some lever progressions with a couple of friends, who kept tell me to arch my back and NOT keep a hollow body.
It kind of bothered me because I've always been under the impression that you were supposed to maintain a proper hollow body position during a back lever so I started looking around at back lever tutorials, Beast Skills and Drills and Skills specifically, and didn't see any direct mention of a hollow body.
Anyway, should I be focusing on a hollow body or should I let my back arch?