Probably, BMX is one of the most fun and extreme disciplines around, as the use of a bicycle with a small wheel and frame on a cross, city or skatepark circuit, makes BMX a spectacular, extreme and Olympic sport (since 2008).
There are two main modalities: Cross & Free Style, the latter with its variants. The former is carried out on a track similar to that of motocross, but on a somewhat different surface adapted to the BMX. Freestyle is the more complex, having up to 6 modalities: -Dirt Jump: consists of performing acrobatic jumps using dirt ramps.-Flatland: the tricks are performed on a flat paved surface, without the need or use of ramps or grinds etc. The riders perform turns standing on the pegs, the frame and the handlebar. -Park: Consists of performing acrobatics using a set of ramps and other cement or wood obstacles. -Vert: where you need a ramp with at least one completely vertical section on the upper part that allows you to jump vertically whilst performing the tricks and landing back on the same ramp. -Street: using natural obstacles found on the street, that is part of the urban terrain. - Street Flatland: a mixture of the flatland tricks combined in an urban space.
Whatever your thing is, you'll need a suitable helmet and protections that will protect you from any possible falls or knocks that you might suffer. And just because of these falls you must have suitable spare parts and be able to replace the components and accessories, as well as revising the drivetrain and brakes.
Finally, if your thing is tricks, learn how via DVD's and books specific for BMX where you'll find all the tips and steps necessary to become an Ace of the most acrobatic cycling mode. And as you always nail that really difficult trick when no one is looking....get a video camera to record your best moves on your BMX.