B.A.S.E jumping -
BASE being an acronym for
Bridges. Antennas. Spans. Earth.
Where Spans are usually bridges and Earth is usually cliffs
Or to those of us that are of a more sedate persuasion, nutters jumping off very high bridges and cliffs and hoping to survive by opening a parachute near the bottom.
For some who find the sport a little tame, you can always add in an extra dimension - a wing suit !
The general idea is to copy the fun of the winged squirrel and glide through the air while falling with style !! Some folks take this to further extremes by adding in a little low level flying.. Like this guy.
Make sure you watch carefully at 1min 40sec !!!
Not much I can add to that !