Thanks for the training advice guys. I'll have to start wearing the vest now. Our head coach wore that thing for a month, it looked miserable, so I can't say I'm looking forward to it.
Have you guys ever noticed your sacrum popping/cracking/snapping? Mine has started popping really often, and most of the time it's when I'm doing normal things like standing up from a chair, getting in or out of my car, even while laying on the floor. It typically is accompanied with sharp pain that lingers for hours, so I'm rather concerned about it.