The Apple Watch connection works differently from every other one on this page, and it is worth understanding why before you set expectations with an athlete.
It runs through the phone, not the web
Apple keeps this data on the phone itself, in Apple Health, and gives no way to reach it from a website. So the Coachbox iOS app is the only route in. Your athlete installs the app, allows Coachbox to read Apple Health, and their Apple Watch workouts show up in a list.
Each workout is a deliberate tap
From that list your athlete taps Sync on the workouts they want in their calendar. That is more manual than a Garmin, and it is also the reason the connection stays clean: a commute walk and a distracted heart-rate reading do not end up in your training log unless someone decided they should.
Turn on Notify me about new workouts and iOS nudges them as soon as a new session is waiting. Tapping the notification opens the app on this screen, so the whole job is one tap.
What you will not get
Nothing goes back to the watch. Apple does not let another app put a workout on it, so your athlete follows the session in the Coachbox app while the watch records.
Sessions recorded by the iPhone or by third-party apps are filtered out on purpose. Those tend to duplicate what another connection already delivered.
