What if you were playing top level NBA and a coach told you of some small change to your game that could improve you exponentially?

What if the coach told you that the change was perfectly legal and within the rules?

What if the coach told you that every player in the NBA knew about it but almost nobody does it?

This is the puzzling story of how top level basketball players refuse to make a small change that could improve their performance and the history of it.

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