Building an AI workout coach in SwiftUI: one-tap logging during the set, GPT-4o analysis after

Most people who track their training in a notes app lose the one thing that matters: set-by-set context. The note does not remember what you lifted last week, and generic gym trackers bury the screen in charts without ever telling you what to do next. The brief for Body Forge was a coach in your pocket: clean tracking during the set, real analysis after it, and programmes that adapt as you progress. Here is how the native iOS app is put together. The workout screen is built for one hand and a sweaty thumb.