Challenge Coach

An AI-powered coach that turns any gym challenge into a structured, safety-focused training plan with visual muscle activation guidance for competitive friend groups.

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Inspiration

Gym friends constantly create micro-challenges like “50 push-ups unbroken” or “bench 100kg first.” The problem is that most people don’t know how to train safely and progressively toward those goals. Many either overtrain, plateau, or risk injury.

I wanted to build something that turns friendly competition into structured, safe progression.

What It Does

Challenge Coach is an AI-powered mobile app that converts any gym challenge into a structured, safety-focused training plan.

Users can:

  • Create or join group fitness challenges
  • Enter their current baseline performance
  • Instantly receive a structured weekly progression plan
  • Track workouts and compete on a leaderboard
  • View exercise cards with form cues, common mistakes, and muscle activation guidance

The app includes muscle group tabs that highlights primary and secondary muscles, helping users understand what they are training and how to train safely.

How We Built It

The app is built using:

  • Expo + React Native for cross-platform mobile development
  • Expo Router for navigation
  • TypeScript for type safety
  • Animated API for smooth UI transitions
  • Structured demo data to simulate AI-generated plans
  • Modular exercise card architecture for scalability

The plan generation logic is designed to be extendable to real AI endpoints, allowing dynamic challenge parsing and adaptive weekly progression.

Safety & Guidance

Unlike typical fitness challenge apps, Challenge Coach focuses on safe progression. Each exercise includes:

  • Step-by-step execution instructions
  • Form cues to prevent injury
  • Common mistakes to avoid
  • muscle activation guidance

This ensures users compete smarter, not harder.

Challenges We Faced

The biggest challenge was balancing speed (hackathon constraints) with polish. We focused on building a fully functional mobile experience first, then layered in safety features and visual muscle guidance for clarity.

We also designed the architecture to be scalable so real AI-driven plan generation can be integrated without restructuring the app.

Future Improvements

  • Real-time AI plan generation based on user input
  • Injury risk detection and adaptive deload weeks
  • More detailed anatomical muscle maps
  • Social trash talk / motivational AI nudges
  • In-app subscription model for premium coaching plans

Why It Matters

Fitness challenges are everywhere, but structured and safe guidance is not.

Challenge Coach transforms friendly competition into intelligent, safe progression.

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