NFL

Not only did Peterson's ACL completely heal in eight months, but he ran for 2,097 yards on 348 carries while playing in all 16 games this season. "Look at my dad. And my mom's side, my aunts and uncles, they're all ripped. At 50 years old, they've got six packs and eight packs," Peterson said. "My body just heals differently. I know it has a lot to do with rehabilitation and work ethic -- but I really credit my genetics for my recovery as much as anything else." Fantasy owners expecting all players coming off ACL tears to burst back onto the scene like Peterson did are asking for trouble. He's a unique exception to the normal laws of medicine.