Who are the Fittest NFL Stars?

Adrian Peterson 1 of 9

When you have a nickname like "All Day" you've got to earn it. For years, impressed players and fans have talked about Peterson's non-stop drive and dedication. After tearing his ACL in 2011, Peterson was back on the field and in top form within less than a year. He's one of the fastest players to reach 5,000 yards rushing and only continues to build on his statistics.