[dishe]

BT headphones, if they are any kind of decent at all, won't need to be anywhere near your head. I've used my BT headphones across a room, or while in an airport with the PPC in my backpack.

You should be able to stick it into any kind of case and be just fine, although I personally leave my phone home when doing any kind of physical activity, and bring a cheapo-cloned phone that doesn't matter to me if it breaks (currently have a Samsung M300 for that task).