In 1997, Armstrong founded the Lance Armstrong Foundation, which supports people affected by cancer. The foundation raises awareness of cancer and has raised more than $325 million from the sale of yellow Livestrong bracelets. During his first retirement beginning after the 2005 season, he also maintained other interests. He was the pace car driver of the Chevrolet Corvette Z06 for the 2006 Indianapolis 500. In 2007, Armstrong with Andre Agassi, Muhammad Ali, Warrick Dunn, Jeff Gordon, Mia Hamm, Tony Hawk, Andrea Jaeger, Jackie Joyner-Kersee, Mario Lemieux, Alonzo Mourning, and Cal Ripken, Jr. founded Athletes for Hope, a charity that helps professional athletes become involved in charitable causes and aims to inspire non-athletes to volunteer and support the community.