Gymmie is deterministic fitness intelligence. It builds auditable training plans from your equipment, readiness, recovery signals and training history — keeping every workout decision in versioned, transparent rules, and using AI only to explain the plan in plain language.
Most AI fitness apps are black boxes — they generate plans you can't trust or audit, and can quietly recommend unsafe loads. Gymmie needed the opposite: training decisions that are deterministic, versioned and replayable, with AI contributing clarity rather than unpredictable judgement.
We built a server-side, versioned workout-prescription engine where readiness gates and safety checks constrain training before any plan is shown. AI is layered strictly on top as narrative — explaining, never deciding. A cached dashboard snapshot delivers fast first paint with streamed insights, transactional completion keeps data integrity, and a deep internal tooling suite gives the team full observability over the system's decisions.
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