In my workout app, my users are typically away from their iPhone during their workout. I understand that with the new Series 3 Apple Watch + LTE this isn't an issue, however for Series 0 through Series 3 (WIFI only), does Apple take care of logging the data on the watch, and more importantly if my user saves his/her data into HealthKit with no WIFI available and the iPhone out of reach will it sync up and save the workout when the iPhone is back within range? If not, what can I do avoid losing user workout data other than not permitting a save to be available unless the iPhone is within range?
If all of your data is stored in HealthKit, you don’t need to worry about this. HealthKit data will sync when the devices are connected.