aderaaij/loopback-training-app ? reverse-engineered prompt

Build me an iPhone app for runners that acts like a private training coach and health data hub.

It should let me sign in to my own server, pull down my active training plan, show the current phase and workout progress, and then schedule planned workouts onto Apple Watch. After workouts, it should read the workout data from HealthKit, send the detailed metrics back to my server, and also sync daily health info like sleep, resting heart rate, HRV, weight, VO2 max, steps, and active energy.

I also want it to automatically check for missed workouts, ask why I skipped them, and send that feedback to the server so the coach can adapt the plan. Please make it feel polished and easy to use on a real device, with background sync, automatic refresh when the app opens, and a simple onboarding flow for connecting the server and approving HealthKit access. If you need to check the latest Apple docs or APIs while building it, go ahead and look them up.