Preview: 60 Minutes Sports

Armen Keteyian reports on an unpopular chapter in the history of football; Pittsburgh Steeler Troy Polamalu returns to "Football Island" to run a camp where the next generation of Samoan football stars are training; and, Garrett McNamara, the legendary surfer who holds the world record for the tallest wave ever surfed, tells Anderson Cooper what it's like to ride such a huge wall of water. Watch 60 Minutes Sports on SHOWTIME Wednesday, August 7 at 9 p.m. ET/PT.