I have heard people complain many times about coming up against guys on the mat in BJJ that treat it like a competition and they shouldnt because it is only training. I dont understand this kind of thinking. At my club there are a group of us that like to roll at 100% and try to win and then there is the other group that all ways say "Well just roll light ok?" I am fine with it since they ask. I just dont know why you wouldnt want to wrestle at 100%. Reasons I am thinking of against 100% would be 1.Cant practice your techniques properly (isnt that what drills are for?) 2.Get injured too much (because your not tapping or the other guy is going to far on subs) 3.tiring out (Not using your energy wisely) I am not trying to bad mouth people that train this way.I would like to hear other opinions though.