Gleason's Gym in Brooklyn, New York is arguably the world's most famous boxing gym, having trained everyone from Muhammad Ali to Floyd Mayweather Jr. Anyone can train at Gleason's Gym — most of the members today are regular New Yorkers learning how to box Gleason's is one of New York City's "last true melting pots," according to owner Bruce Silverglade To call Gleason's Gym in New York City a "mecca" of boxing is an understatement.