Awesome thread.
Bodybuilder here (I don’t coach, but here’s my perspective). The Apple Watch for me primarily is my calorie burner/and notification device. I don’t carry my iPhone with me in the gym and the watch eliminates that, especially being I work around Weights/machines frequently, I’d rather not take the risk of breaking my iPhone. Anyways, it’s a _great_ tracking device To monitor the heart rate as well. The fact you can store/play your music is a stellar feature.