Originating from motorcycle trails in the early 20th century, motocross is a form of motorbike racing that takes place on off-road circuits. Motocross is a popular spectator sport, and itês a thrill just to watch the bikes in action, but when you get out there yourself, the rush is second-to-none. Racing against other bikes over a dirt track is very physically intense -especially on some of the trickier courses. And donêt think that wet weather will mean your motocross session is rained-off _ the conditions just create a more slippery track and a different environment for racing..