BMX is Bicycle Motocross. It was started in California in the early 1970's by some kids who wanted to emulate motorcycle motocross racing. There are now hundreds of tracks across the country and around the world, and thousands of racers. BMX race tracks are usually around 1000 feet long and consist of banked turns (berms) and jumps. Most of the track is dirt but berms on some of the tracks are paved. The National Bicycle League Grand Nationals comes around once a year and is the grand-daddy of BMX races in North America and is attended by amateurs, pros and some who will be attending the Olympic summer games in Beijing.