Bo Jackson
Good pick. Fucking stud right there....
Hard to say one guy was the "greatest" athlete of all time. I have several picks...
Barry Sanders - I feel fortunate to have seen him play.
Jerry Rice - Look up work ethic, Jerry's picture will bet next to the definition. The man was a Legend among boys.
Barry Bonds - Like him or not, he is arguably the best player of his generation. Even pre-drugs.
Michael Jordan - What can you say? Another legend who played among greats, and still managed to stand above.
Lots of others, but those are off the top of my head.