Guest: Jeff Bercovici, author of "Play On: The New Science of Elite Performance at any Age"

Ann talks to Jeff Bercovici about athletes who are are past their so-called peak age who are thriving; about how Tiger, now 42-years-old, and after 4 back surgeries, has altered his training regime; NBA Coach Gregg Popovich’s philosophy on practice; Phil Mickelson, Roger Federer, Lebron Brown, Tom Brady and other elite athletes about their training and diet strategies as they get older.