They fall out of my ears just sitting in a chair. I can't imagine how they would fall out when running. Now they do come with the clip you can put around your ear - then they're more stable, but I didn't buy them to need the clip. I wanted real earbuds, not the kind that clip around your ear. The sound though is very good and the pairing was easy. Haven't used them enough to determine battery life, but I'm sure that will be fine.