In this April 19, 2008, photo, riders make their way around the track during an AMA Supercross motorcycle race in St. Louis. The first Supercross race was held in 1972 when a racing promoter held what was called the Super Bowl of Motocross inside Memorial Coliseum in Los Angeles. Two years later, AMA Supercross became a series with four sanctioned races spread several weeks apart. Now, as Supercross gets set for its 40th anniversary season, everything about the sport has become bigger and better: The tracks, bikes, riders, money, support and TV coverage. (AP Photo/Jeff Roberson)