Dirt biking
There arev four parts to dirt biking they are motocross,supercross,hillclimbing,and freestyle.Motocross is racing without ruts in the middle of the track.Supercross is racing with ruts so it is harder to race. Hillclimbing is going up steep hills with a dirt bike its very hard and you try to get up the hill for distance. Finally Freestyle is probably the hardest of them all.
