Two A+ athletes (superstars Jim Brown of NFL and Wilt Chamberlain of the NBA) were tempted to try the theory that an A+ athlete could become the boxing heavyweight champ with just a few months training - both wanted to fight Muhammed Ali. On investigation both decided it was extremely unlikely they had any chance at all, and so dropped the idea (in Brown's case after meeting Ali in a park for a test, putting on gloves, and spending a couple of minutes swinging and missing at Ali, who threw no punches in return).
Fans of A+ athletes are more optimistic about how easy it is to learn how to fight than the athletes themselves.
BTW, both or kind of interesting stories, lot's of stuff about Ali's come up since his death.