Is it possible to easily share an Apple Watch in the same way that a couple can share a Mac and an iPad? Since this is a first gen product, I was thinking of purchasing a pink Watch Sport and buying a black band for myself. She doesn't do any physical activity so it will most likely be me using the fitness functions. What worries me is the calendar and iMessage notifications. Is it easy to sign in and sign out of your Apple ID the way you can do it on an iPad? Or would I be forced to reformat the watch everytime we want to share it?