O. J. Simpson used to be a running back.
The 2,000-yard club is a group of seven National Football League ( NFL ) running backs that have rushed for 2,000 or more yards in a season . O. J. Simpson . In 1973 , he became the first NFL player to rush for more than 2,000 yards in a season ; holding the record for the single season yards-per-game average , which stands at 143.1 .