Dirt Bikes are the 2nd most physically and mentally challenging sport in the world behind soccer. They are very challenging because the big jumps, braking and acceleration bumps, turns with ruts, and other people in general can be scaring to ride with. Some of the best pros an older pros are Ken Roczen(Current), Ryan Dungey(Retired), Eli Tomac(Current), and Bob Hannah(Retired). Some of the bikes there are is Yamaha, KTM, Suzuki, Honda, and Kawasaki. The CC’s there are is 50, 65, 85, 125, 250, and 450. In the pros they race 250 and 450. There are different types of racing. Nationals, Supercross which in a stadium, Enduro which is distance and riding over logs and rocks, etc, Arenacross which is smaller supercross, and Trail riding which can be slow but also really fast. When riding you need a helmet, set of gear(jersey and pants), knee pants, socks, goggles, boots, chest protector, and neckbrace if wanted. It is really fun.