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Floyd Patterson throws a punch at Muhammad Ali during their 1965 fight at Las Vegas Convention Center. Ali would go onto win by a TKO in the 12th round. (Neil Leifer/SI) GALLERY: Never-Seen Photos of Muhammad Ali

Floyd Patterson throws a punch at Muhammad Ali during their 1965 fight at Las Vegas Convention Center. Ali would go onto win by a TKO in the round. (Neil Leifer/SI) GALLERY: Never-Seen Photos of Muhammad Ali

'Be yourself; everyone else is already taken.'    Photography of Mohammed Ali    Mohamed Ali // Cassius Clay

LIFE magazine ran one of the late Flip Schulke's photographs of Muhammad Ali in 1961 "training" underwater in a Miami swimming pool. Ali swore that the underwater workouts made him the fastest heavyweight in the world.

Muhammad Ali and Joe Frazier

siphotos: “ Muhammad Ali lands a right hook to the head of Joe Frazier during their fight on Oct. 1975 at Araneta Coliseum in Quezon City, Philippines. Ali won the “Thrilla In Manila,” the third.