About two weeks ago, Beckham's hamstring began to show serious progress and the receiver began practicing and buzz started to build that he might be ready for his NFL debut. About a week before that, Beckham sought out Jennings, the running back with the custom-built warmup routine. Beckham has since adopted that routine, and while it hasn't healed his hamstring (old-fashioned rest and rehab get the credit for that), it could play a critical role in keeping the injury from recurring.