Ask Engadget: best earbuds for fitness use?

We know you've got questions, and if you're brave enough to ask the world for answers, then here's the outlet to do so. This week's Ask Engadget inquiry is from Brandon, who needs some earbuds that won't leave his head when he's on the treadmill. If you're looking to ask one of your own, drop us a line at ask [at] engadget [dawt] com. "I've been having issues at the gym with my headphones coming out of my ears. As of now, I'm using a basic pair of Sony sport headphones, but is there a pair of mo...