Why do they do that, though?  They glance behind themselves and just drop onto whatever is behind them.  Always.  It's not controlled.  It's just free fall and hope for the best. And then, when they try to get up, they have to rely on whatever is in front or beside them for assistance.  Fats are completely incapable of getting from a sitting to a standing position just using their abdominal muscles (amusing since they always claim to be so muscular and strong).