The Bills safety wants to give back after suffering cardiac arrest a month ago. On Jan. 2, Buffalo Bills safety Damar Hamlin went into cardiac arrest after collapsing on the field against the Cincinnati Bengals. He received an outpour of support from players and fans, and now wants to return the favor to the medical staff that ultimately saved his life. Hamlin recently announced a collaboration with the American Heart Association (AHA) for the “Damar Hamlin 3 for Heart” challenge. He called upon LeBron James, Tom Brady and Michelle Obama to help him. “CPR saved my life earlier this year…