I use my STAmina app a lot when I train in the pool. So far, my coach has controlled my iPhone app while I have been submerged, and my coach has verbally passed on the information from the app to me. It would be a cool detail if the iPhone app and the Apple Watch app communicated with each other, so that my coach can start a table on my iPhone, and the Apple Watch app starts up synchronously on my watch. This way, my coach can follow my table, while I record my dive including my Heart Rate from my watch.