I remember in 2003 when Jamal Lewis became just the fifth NFL running back to achieve 2,000 rushing yards in a regular season. Chris Johnson, Adrian Peterson and Derrick Henry would repeat the feat in 2009, 2012 and 2020, respectively. It required such a particular amount of scheming on offense beyond the pure grit, longevity and skill from the running back position itself in order to get there. The mark is not one we see repeated with any sort of regularity.
Of course, Lewis, Johnson, Peterson and Henry all had 16 games to do it. Because they’re in the NFL.