Do you guys really think that Lebron James is one of the greatest pure athletes on the planet?
You do realize that he competes in a sport in which success is highly dependent on mastering complex skills such as shooting, dribbling, and passing. Great players have to think on the spot and memorize complicated defensive and offensive schemas.
Also, this is a sport where height is a very significant advantage and taller less skilled athletes will often be more successful than average sized more skilled athletes. Do you think he would have won the MVP award this year at 5'9?
Surely, Lebron james is a gifted athlete who has mastered many skills vital to the game of basketball, but do you really think he is gifted in all aspects of athletics?
I would assume that there are many high school kids with a body type more geared towards running with greater natural talent for running who would crush him easily.
Sub-50 would be almost an elite time, so I highly doubt that he could achieve this.