When you first set up your Apple Watch, it needs to be calibrated with an outdoor run (or walk) before it can accurately measure indoor workouts (i.e. running on the treadmill). I never run outside, but in order to get accurate measurements for my regular treadmill workouts I went for an outdoor run when I initially purchased my Apple Watch. After that it was calibrated and my indoor runs were measured accurately. Fantastic. But then I discovered an annoying problem. Whenever you restore your watch from a backup or pair it with a new phone, that calibration data is lost. This has happened to me 3-4 times since I got my Apple Watch, and every time I've been forced to go for an outside run to re-calibrate. I know this doesn't sound like a big deal, but 1) I just generally hate running outdoors and 2) it's annoying to me that I'm forced to do this every time I restore my Apple Watch. Question - does anyone know if this calibration data is now backed up with WatchOS 2.0? It seems like such a trivial thing to fix. I'm thinking of trading up to an iPhone 6s, but this one issue is literally holding me back. I don't want to have to re-calibrate my watch yet again when I get the new phone.