a little but I usually only pop my iPod in there. I have a band for the phone. And I only ever pop it in the upper cup near the strap. I have tried heaps of different arm bands. My old one for the iPod (which I lost 12 months ago and still can't find!) was uncomfortable - too harsh a material. I bought one not long ago for the phone which had no give in it and was really uncomfortable. Probably the worst I've tried. That was returned quick smart! The one I have at the moment is a softer material, easy to use the controls on the device through the plastic (every other one I've tried it's been difficult), and just generally very comfortable. It is pink which clashes with my blue gym shirt but that's ok DH bought it but I'm not sure where from. Possibly JB HiFi.

Pre iPod, I use to pop my MP3 in a little pouch which I would then safety pin either to my gym towel or my gym clothes (usually the pants) depending on what I was doing.