Credit to insidefighting:
BJ Penn may have actually trained. This can only be a good thing. One of the greatest things about him moving back to 155 lbs may that in order to get down there he has to, you know, do cardio.
Without straying too far, I cannot imagine what it must be like to be BJ Penn. Having that level of talent is something I cannot comprehend.
BJ Penn, in terms of physical gifts, is the most talented MMA fighter who has ever lived. I know there are some sections of the board who will call him a, sometimes, tubby fuck and then dismiss him because his bench does not meet their expectations. However BJ is frightening.
He acquired his BJJ black belt in three years, faster than any other American. He was the first non-Brazilian to win the black belt division of the Mundials.
He has great stand-up.
Matt Lindland won an Olympic Sliver medal in wrestling. Lindland has spent his whole life wrestling. He thinks that BJ Penn is the best athlete he has ever encountered. BJ spent, something like, a month training with him. After that month Lindland said that HE had trouble taking Penn down.
BJ Penn fought Loyto. This is prior to Loyto moving to 185 lbs. Loyto has stopped Bonnar and Franklin at 205 lbs. BJ went to distance. Yeah, I know David Heath did the same thing at UFC 70 however BJ is a guy who turns up carrying fat at 170 lbs.
Basically, BJ actually training properly is a truly great thing.