kinda off subject, but in places where they fight a lot, like thailand their fighters don't spar hard as the injuries would cripple them in the weekly fight....keep in mind, that although resiliant the human body can get broke down after too much hard activity...work on controlling the mind...that would be useful.try reading the book ON COMBat by lt.col Dave Grossman was recomended to me by a former olympian that was kind enough to share his time with me....it covers a lot of ground on how the body reacts particularly the nervous system to combat...also if you ever are in the area and need a sparing partner, i sit at around 200 and would be happy to help,in exchange for some coaching pointers...