Career years: 1978-1985
Career stats: 9,407 rushing yards, 4.3 YPC, 74 TDs
Injuries: Multiple knee and back surgeries, nerve damage in spine

Earl Campbell was an absolutely wrecking ball on the field, an incredible blend of speed and strength that made him the game's greatest running back for a six-year stretch from 1978 through 1983. He averaged almost 1,700 yards and 15 TDs over his first three seasons in the league, and looked like he was on his way to becoming one of the greatest of all time. However, he also averaged 348 carries per season over that stretch, and the absurd workload took its toll as Campbell's performance began to decline rapidly after his transcendent 1980 season. He retired after 1985, just his eighth season in the league. He now has trouble walking.