Alot of good names on here! (Although I can't believe people are still putting Emmit Smith's name on lists like this! Come on!)
Del Piero, Madini, Montana, Gretzky, Payton (& Peyton), Bird, Jordan, Pele (surely he must be included!), Big Mac, Ichiro, Woods, Armstrong...
(let's not forget Agassi & Sampras guys!)
...notice this? Despite the bad press given (deservedly) to many athletes for being bast@rds, look how many "good" guys there are playing.
In the end though, if I have to just pick one that is my personally fave, I simply must go with Barry Sanders.
5'8", 203bs
Squatted 600 pounds in college
During the only year he was the featured back at OSU (his junior season, after playing for 2 years behind Thurman Thomas):
344 attmpts, 2,628 yds!(NCAA record), 37 tds!(NCAA record), 7.6 yrd/rsh!!
1988 Heisman winner (unanimous after setting 13 NCAA season records)
10 NFL seasons, 15,269 yrds, 319 tds, 5.0 yrd/carry (carrier - 6.1 yrd/carry in 1997 season)
1989 Rookie of the year (with 1,470 yds - 5.3 /carry? Yeah, I think so)
1st back in history to rush for 1,000+ yards in 10 seasons in the NFL (yes, that would be every season he played)
1st back in history to rush for more than 1,500 yards 4 years in a row
Holds NFL record for most 100+ yard games in a row (14)
Holds NFL record for most 100+ away games in a row (10)
1997 rushing totals were 2nd highest in league history
3rd player to ever rush for 2000 yards in single NFL season
Became Lion's all-time leading rusher after 3 seasons
0 footballs spiked after touchdowns
0 endzone dances
"When you get in the endzone, act like you've been there before..."
Sanders
...and he retired in the midst of his prime after the 1998 season...