Four-time Pro Bowler Arian Foster says he can no longer take the punishment an NFL running back endures, so he is retiring midway through an injury-plagued season with the Miami Dolphins. Foster, 30, tried to come back from a torn Achilles tendon, but was slowed this season by groin and hamstring injuries. ''There comes a time in every athlete's career when their ambition and their body are no longer on the same page,'' Foster wrote. More...