Click to open image viewer. An image of Muhammad Ali and Joe Frazier in 2003. The two are featured next to one another in their boxing robes. Ali, left, is seated and is wearing a silk Everlast robe.

Muhammad Ali redefined heavyweight boxing—he broke every rule about how big men should fight. Across 21 years as a professional, Ali won 56 fights (37 by knockout) and lost only 5. Ali turned fights ...