Especially if it falls out of your ear. I've always had trouble getting the EarPods to stay in my ear while running. I had to loop the wire above and around my ear; I can't do that with the AirPods.
I have the same problem and use the loop method as well. I have tried quite a few headsets and like them the best though. I think the real reason why they fall out is the weight of the wire lightly tugging the bottom of the ear bud. I'm hoping the lack of wires will solve that issue...
I listen to music most while on the bike, even in-ear earbuds just randomly fall out of my ears very often. I can't imagine finding one of these if they were to fall out of my ear during fall.