it is a really fun one, that you should check out. pressing it again, will end the call and resume your music. if you suffer from low-back problems, avoid the standing calf raise, and use an alternative such as straight-leg calf presses on a leg-press machine. dents and dirt can cost you a few dollars. but because its very personal, and its hard enough admitting to yourself that this is the way you are feeling, let alone writing it down for hundreds of people to see. 