The wireless ear buds are a god send for my treadmill or rowing machine.  I got some cheap Chinese knockoffs for $30.  Maybe my stride sucks or something, but the wire bouncing around on the treadmill always pulled them out of my ear.  Also, any slack in the wire on the rowing machine made me worried about it getting caught on the slide. That being said, I'm sure the ability to do cardio with the ear buds wasn't even a consideration for her.