Powersports are a subset of the generalized category motorsports. Examples of powersport vehicles are motorcycles, ATVs, snowmobiles and PWCs. One of the defining features of any powersport is the use of an engine, in one form or another. Other defining features of powersport vehicles include the use of handlebars to control movement and the mounting of the rider "on" the machine, exposed to the elements. Powersports have always had a following as spectator sports, and with the introduction of the X-Games, even the most extreme, fringe varieties have become commonly known.