While the reasons might remain cloudy, what's clear is that Barry Sanders knew what he was doing when he retired.
Barry Sanders might have left football early, but before he did, he piled up Hall of Fame numbers.
Emmitt Smith is the NFL's all-time leading rusher. SportsCentury: Emmitt Smith airs Sunday, April 30 at 10 am ET.
More on Emmitt Smith
ESPN Classic celebrates Emmitt Smith's becoming the NFL's all-time leading rusher with a Classic Emmitt Smith night on Thursday from 8 p.m. - 4 a.m. ET. Smith broke Walter Payton's record of 16,726 career yards vs. the Seahawks on Oct. 28.
ESPN Classic catches up with former Heisman Trophy winner and Oilers/Saints powerful running back, Earl Campbell.
Emmitt Smith scores his record 25th touchdown of the season (all rushing) in the Cowboys' 37-13 win over the Cardinals in Tempe, Arizona.
Walter Payton is the 2nd all-time leading NFL rusher with 16,726 yards. SportsCentury: Walter Payton airs Monday at 4 pm ET.