Recovering from a major knee injury is no small feat, but Adrian Peterson is no ordinary running back. The Minnesota Vikings' RB is on pace to rack up over 2000 yards this season. Impressive, right?

What about Peyton Manning? Four neck surgeries and a year away from playing football had every fan wondering if they'd see the wily gunslinger play again. This season, he's led the Denver Broncos to the top of their division and a berth in the playoffs.