🧠 FlexAI – Smart Fitness at USF

✨ Inspiration

As students at University of South Florida, we realized how hard it can be to stay motivated, discover workout routines, or even know what resources are available on campus for fitness. FlexAI was born out of the desire to create an AI-powered fitness companion that understands each student individually — from their dorm location and dietary restrictions to their fitness goals — and builds a plan that’s personalized, fun, and community-driven.

We wanted to make something that wasn't just another fitness tracker — but a smart assistant that adapts to you, and also rewards your efforts.

🛠️ How We Built It

FlexAI is built using SwiftUI for the iOS interface and integrates with Firebase for authentication, Firestore storage, and user profile management. Here's a breakdown of the core components:

FirebaseAuth: For secure user login/signup (including Google Sign-In)
Firestore: To store user data, AI-generated workout plans, social posts, and challenges
SwiftUI: Clean, reactive UI across onboarding, dashboard, and social views
AIPlanService (custom class): Generates detailed workout plans based on user preferences and bio data
Multi-step Onboarding Flow: Captures user info including height, weight, dorm, dietary restrictions, and preferences
Dynamic Dashboard: Shows AI workout plan, personalized challenges, and point-based rewards system

💡 What We Learned

How to build a multi-step onboarding flow with state-driven navigation
Integration of FirebaseAuth and Firestore to sync real-time data with UI
Handling Firestore permissions, data models, and conditionally rendering views (like skipping onboarding for returning users)
Implementing a modular architecture using @EnvironmentObject and @Published to keep the app reactive and scalable
Designing user experiences that combine AI, social motivation, and gamification

⚠️ Challenges Faced

Handling the state-based flow transitions (e.g., onboarding → dashboard) while keeping everything reactive in SwiftUI
Preventing redundant Firestore calls and syncing data only when necessary
Ensuring compatibility between Google Sign-In and FirebaseAuth
Making the UI intuitive while packing in multiple features like group discovery, challenges, and AI insights