How Andrew Luck's retirement might shape the NFL's future

Over the weekend, star NFL quarterback Andrew Luck retired at the prime age of 29, citing his many injuries as the reason. The past few years have seen revelations about the physical toll NFL players face, including CTE and other potential brain injuries. Today on Front Burner, Globe & Mail sports columnist Cathal Kelly joins us to discuss how this shock retirement might shape pro football, and whether the sport is viable in the future.