I noticed the same thing. I have a strong core &  really balance from 20 yrs of skateboarding & dancing. I'm also a little clumsier than most people especially when in a hurry. But if I trip or stumble on something those self righting reflexes kick in automatically and Ive very rarely actually hit the ground/managed to not right myself. With fats it's almost like their brain just goes "fuck it, hit the floor at top speed!" It's bizarre to watch, just looks so unnatural.