Well theres so many greats its hard to say who was the greatest ever. I mean look at Bill Russel, poeple talk about all of Michael Jordans rings that they forget that Bill Russel had like 5 more. Even though i do think Michael Jordan is either the greatest or right next to it. Another great is Peyton Manning, how he can judge a defense, he didnt win many championships but he made his teammates and did a lot in the community. Lance Armstrong would have to be mentioned up there somewhere. I mean he did win a heck of a lot of titles. I think even Tim Tebow will be one of the greats, not because of just on field what he can do if they let him mature more in the NFL but what he does off the field. He's already one of the most inspirational guys of today. But hands down most athletic guy, just talking about his pure abilities would have to be Herchel Walker. He was the most athletic and he has been doing 1500 pushups and 2000 sit ups a day since he was 18. At 50 years old he is in MMA and isn't doing too bad for 50. One fighter said that if Walker was in his 20's he would dominate in any sport. And of course BLACKANDGOLDJACK's pick of Muhammed Ali, not only an inspiration in the ring but outside as well. But i never liked how cocky he was. The only person who can be that cocky in my opinion and should probably be up close to number one is Bruce Lee. He not only had speed, the man had incredible strength and hitting power. Ever see the 1inch punch? Just incredible.