Motocross is the most popular form of amateur motorcycle racing in the United States, and with classes for machines from 50cc to more than 450cc, and riders age 4 to 50-plus, it's a sport for the whole family.

Motocross races are run over natural- and man-made terrain courses with hills, jumps and tight turns, typically with two races -- or motos -- in each class. A combined score from each moto is calculated to determine the overall placing. Recognized as one of the most strenuous sports in the world, motocross is also one of the most fun.

Each year, the best amateurs in the country compete for a spot in the prestigious AMA Amateur National Motocross Championships, with the best of the best winning the AMA Motocross Horizon Award, presented to the amateur racer who has demonstrated the most promise for a successful professional career.

Just about every professional motocrosser in the United States today has passed through the AMA amateur motocross competition to reach the pro ranks.

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