i only ever saw dirtbikes in this kind of race... its like an indoor arena that is motocross with big jumps, but also it has logs, rocks, tractor tires, mud, and everything you can imagine to challenge the riders ability to get through tight technical terrain. i think its called endurocross. i love the gncc and hare scrambles and woods racing but i also love the motocross track too so, why not make both into one, oh and just for a good challenge throw in a big monster hillclimb to top it all off.