This article is from the Frisbee Dogs FAQ, by Kevin Robair with numerous contributions by others.
While catch and retrieve is the most common event, and the easiest for
beginners, the most spectacular and fun to watch canine Frisbee event
is freestyle. This event consists of a timed routine, usually
performed to music. The routine is a choreographed presentation of
tricks that involve, many different types of throws and catches. Some
of the more spectacular tricks involve the dog leaping off the leg or
back of the thrower and catching a disc that is tossed high in the air
for the dog. Other tricks have the dog doing a half backflip combined
with a half twist while catching a disc tossed over their head from
the front (don't worry if you can't picture it, just go to an event
with freestyle and see for yourself! ). The tricks one sees in
freestyle are only limited by the creativity of the performers.