The physical gifts that allowed Minnesota Vikings running back Adrian Peterson to return better than ever from major knee surgery apparently run in the family.
Peterson, in Hawaii for his fifth Pro Bowl, told NFL.com that comparisons can't be made between his return from torn anterior cruciate and medial collateral ligaments in his left knee and the recovery ahead for dynamic Washington Redskins quarterback Robert Griffin III, who tore the ACL and lateral collateral ligament in his knee during a playoff game earlier this month.
Peterson, who returned to game action just over eight months later and rushed for the second-highest single-season total in NFL history with 2,097 yards, said he had a built-in advantage.
"This is also a matter of genetics," Peterson told NFL.com's Jeff Darlington this week. "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.
"My body j...