It's been going on for about 3 weeks now and I'm having a blast. But recently, when I start rolling, my organs (mainly kidneys) will start to feel compressed and painful and this will continue for a while even after I stop. Now I'm pretty skinny (6'1, 140 lbs) so I'm pretty sure it's from the really heavy guys constantly putting all their weight on me. Is this something to worry about? Thanks :icon_chee