I use my iphone while lifting weights and its fallen out of my pocket numerous times without any damage. I don't use a case either. You have to be reasonable, obviously if you drop a barbell on your iphone it will break--but so will a nano. Many gyms have a rubberized floor and when the phone is likely to fall is when you're pretty close to the ground anyway.
It's so funny how people treat their iphones like they are made of eggshells.
It's so funny how people treat their iphones like they are made of eggshells.