My biggest struggle is breathing. I'm always dead last and my insides start burning. I get that pinch on the side of my gut as well after a good run. I know I'm going to lose pretty much everything, but I will gain a better airway, and that is going to make such a major difference. Aside from that, I've been on the muscle gain/lose yo-yo cycle forever and I keep blaming it on my airway. I really hope I can break this cycle once and for all.