BASE (Building, Antenna, Span, Earth) jumping is where you jump from fixed objects such as cliffs and mountains with the aid of a parachute. This extreme sport is more dangerous because its typically performed at much lower level giving you less of a window to open your parachute.
Wing walking is the act of walking out onto a wing of an airplane while it’s in the air.
Freestyle motocross (or FMX) is the sport in which you use a motorcycle for stunts and tricks such as flips, like the back flip, double back flip and the whip flip.
It’s a type of skydiving where a board is strapped to the diver’s feet. They usually do stunts or acrobatics on it on the way down.