How about Renaldo Nehemiah? World-record hurdler, world-class sprinter, won a Super Bowl ring as a WR, dominated the Superstars competition in the early 1980s.
Agree with Herschel Walker suggestion: fast enough to be a factor on the track, strong and agile enough to participate in collision and combat sports.
If adjusting for era, gotta have Jim Thorpe. Jackie Robinson may warrant consideration, too: he was a four-sport letterman at UCLA.
Wilt Chamberlain was an all-conference runner and jumper in college, and was also an accomplished volleyball player.
Maybe Bob Gibson? Was a basketball star at Creighton and spent a year as a Harlem Globetrotter before starting his professional baseball career.
Bo Jackson and Deion Sanders were assets in MLB and NFL, both had world-class speed. Also liked Dave Winfield suggestion.