Don't know I will tell you when I find out. I presume much the same as when your to fat and sit on a shetland pony.
Fixed wing pilots have for years been advising folk of the inherent danger of getting in one of those contraptions nobody listens.
Gliding is cracking, no need for an engine, the folk that are good at it can keep them up for hours (alot long than my bladder can last). Only issue with thermals is when an eagle or something big objects to you being in thier's. Last time I went gliding a buzzard shat on my canopy which I reckon shows great skill on the part of the buzzard being able to hit a moving target like that.