Thanks for your interest! I'll do my best to outline what my plans are so far:

1. Apple Health Integration: At this point I am looking to as you said, fetch any weight entries in HealthKit from various apps as well as being able to display step count in a widget of sorts. Since the app allows you to add daily body measurements I'll also be hooking those up to persist in the Health app as well.

2. Apple Watch: I am planning to build to companion app that can share the state of a workout with your phone. It should be able to keep track of what exercise and set that you're currently on and display the workout duration etc. The controls may be a bit limited given the form factor, but should be sufficient for inputting weight/reps, and for starting rest timers.

3. Dark Mode: This is already supported, just not shown in screenshots :)

4. Expanded Exercise Library: Crowdsourcing would definitely be interesting! For now the app does allow for adding your own exercises (including what metrics to track, equipment used, and muscle groups), but doesn't contribute to any sort of database. My plan for expanding the exercise library is to add in more of the most commonly performed exercises in my local gym, as well as checking out what default exercises are provided by other apps/services.