From Michael Burkhardt at 9to5Mac:
Within Reach has a couple headlining features to help you track your weight loss journey with GLP-1s, though its also useful for those who aren’t using weight loss medications.
[…]
As hinted at prior, Within Reach lets you plan your workouts in the app for keeping you on pace. It also offers Siri Shortcuts and Widgets – so everything feels at home on the iPhone.
Developer Matt Corey also makes Signals for HomeKit, which responds to Apple Home triggers.