As a reply to several comments...
-RJJ relied on his athleticism, his reflexes, etc...he oriented them to boxing, and he fired his father for insisting he learn how to fight. He slowed down, he became a target with no chin, no heart, nothing to work with.
-Hopkins, on the other hand, had the heart to be a fighter. he focused the skills he had- had he focused them otherwise, maybe he could have beat Jones at basketball-and he had the heart to be a fighter. he learned and that skill has surpassed his athleticism and made him more money than his physicality ever did.
-reflexes will screw you. The whole motion of you avoiding an opponent's punch and countering it isn't based on you being faster. Ever wonder why so many fast guys hit an opponent so many clean shots and he's still there? It is like playing a 45 RPM record (

??) at 78, it is out of time. You have to time your opponent.
-hand eye co-ordination does not necessarily translate. Just because you can hit a fastball does not mean you can slip and counter a jab. A guy, in 2006, brought his son to me, an all star Baseball player and a scratch level golfer. he was sure his son could fight- and I guess he could, big and strong he'd beat most of his peers. But to teach him to box...Balance is sport specific because you use your feet very differently.
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