1. He won an Olympic Gold Medal after boxing only 1.5 years and with only 20 amateur fights going into the Olympics. That is just unbelievable, in some ways his most notable achievement.
2. He destroyed an undefeated heavyweight champion who was considered the best heavyweight in the world at the time, crushed him in only 2 rounds and ruined his reputation to this day, Joe Frazier who was a true all time great. Smokin' Joe is an equal to Marciano, but does not get the credit he deserves because of his loss to Foreman.
3. Big George came back and won the lineal heavyweight title 20 years after losing it. That is just mind boggling. No one and I mean no one else could do that, not Jack Johnson, not Jack Dempsey, not Joe Louis, not Rocky Marciano, and not Muhammad Ali. Nobody.
Of course the talk is about George Foreman
http://coxscorner.tripod.com/Foreman2.html
I'm a huge fan of George, incredible man