Some guys are just physically more gifted than other guys. I mean look at Bill Russell compared to pretty much everyone else in the league at the time. Bill made them look weak and unathletic. And then look at Bill next to Wilt. Wilt dwarfed him. Not just in height, but strength, speed, stamina, etc. Wilt was just a physical athletic freak. He was bench pressing 500 pounds in his 40's. That was before steroids, HGH, etc. Some guys just have physical traits that are other wordly. I suspect that is Lebron. Now sure maybe Lebron has been juicing since he was 13 or maybe he just is one of those rare physical specimens that comes along every so often.