This article is from the Hanggliding and Paragliding FAQ, by Joao Geada with numerous contributions by others.
(from SUpine and PRONE) Flying in a seated position within the
confines of the control bar. Feet may rest on a stirrup or on the base
tube. Control is by hands on the uprights. This position is far less
common than supine and requires placing ones feet up and over the base
tube after launch and back behind the base tube before
landing. Perhaps the best advantage to this method is that more speed
may be achieved and that the glider's control bar does not have to be
re-rigged from the prone position. This is the postion used by the
Wills Wing Sky-Floater system utilizing modified paraglider harnesses.