ORIGINAL: AH1G
Serveral folks I've known used to fly sailplanes sitting in lawn chairs. Very relaxing until you find someone that tries it that flys with body language. One gent fell out of his chair and almost lost his plane.
We used to fly sailplanes laying back on blankets.
As far as flying sitting down, the problem Isee is being unable to avoid an errant model. Every so often we hear a shout and someone puts one along the flightline behind the barricades.