Bmx

Freestyle BMX is a name for BMX stunt riding. It consists of five disciplines: "street," "park," "vert," "trails" or "dirt jumping," and "flatland." (Go to a bike park and ride)
Disciplines:
Park
Skateparks are used by BMXers as well as skateboarders, inline skaters and freestyle scooter-riders. Skateparks themselves can be made of wood, concrete or metal. Styles of riding will depend on the style of the parks. Wood is more suited to a flowing style, with riders searching for gaps and aiming to air higher from the coping. Concrete parks usually tend to contain bowls and pools.
Vert
Vert is a freestyle BMX discipline performed in a half pipe consisting of two quarter pipes set facing each other (much like a mini ramp), but at around 10–15 feet tall.
Trails
A freshly built double at the overlook trails in New Jersey.

Trails are lines of jumps built from dirt (heavily compacted). It can also be named as a pack such as a 4 pack, 6 pack and 8 pack. The jumps consist of a steep take off, called a lip, with an often slightly less steep landing.