calm-fitness System Requirements Document

Introduction

The project, calm-fitness, aims to develop a world-class AI-powered fitness and nutrition mobile application called GymDiet AI. This application is designed to generate a 100% personalized diet plan for gym-goers, athletes, bodybuilders, calisthenics practitioners, and fitness enthusiasts through an interactive AI conversation.

System Overview

GymDiet AI is a mobile application that combines the functionalities of a professional nutrition coach, personal trainer, and dietitian into one intelligent AI assistant. The app will leverage AI to conduct natural conversations with users, gather essential fitness and dietary information, and generate personalized diet plans. It will also include advanced features such as progress tracking, recipe recommendations, and a grocery shopping list to enhance user experience and retention.

Functional Requirements

• As a User, I should be able to interact with the AI chat system to provide my personal and fitness details.
• As a User, I should be able to receive a personalized diet plan based on my inputs.
• As a User, I should be able to view detailed nutritional information for each meal.
• As a User, I should be able to track my progress and weight over time.
• As a User, I should be able to receive AI diet adjustments based on my progress.
• As a User, I should be able to use a barcode food scanner for quick food logging.
• As a User, I should be able to use voice input to interact with the app.
• As a User, I should be able to view beautiful charts and analytics of my fitness journey.
• As a User, I should be able to receive recipe recommendations.
• As a User, I should be able to plan my meals weekly.
• As a User, I should be able to generate a grocery shopping list based on my meal plan.

User Personas

• Gym Enthusiast: Regular gym-goers looking to optimize their diet for better performance.
• Athlete: Professional or amateur athletes needing specific dietary plans for peak performance.
• Bodybuilder: Individuals focused on muscle gain and body composition.
• Calisthenics Practitioner: Users who prefer bodyweight exercises and require tailored nutrition.
• Fitness Enthusiast: General users interested in maintaining a healthy lifestyle through balanced nutrition.

Core User Flows

1. User initiates AI chat -> Provides personal and fitness details -> Receives personalized diet plan.
2. User views meal plan -> Checks nutritional details -> Generates grocery list.
3. User logs meals using barcode scanner -> Updates progress -> Receives AI diet adjustments.
4. User tracks weight and progress -> Views analytics and charts -> Adjusts fitness goals.

Visuals Colors and Theme

• primary: #1A1A2E (Deep Navy Blue)
• primary_light: #16213E (Lighter Navy Blue)
• secondary: #E94560 (Crimson Red)
• accent: #0F3460 (Dark Blue)
• highlight: #F9D342 (Golden Yellow)
• bg: #0F0E17 (Dark Background)
• surface: rgba(255, 255, 255, 0.1)
• text: #FFFFFF (White)
• text_muted: #A6A6A6 (Muted Gray)
• border: rgba(255, 255, 255, 0.2)

Signature Design Concept

The homepage of GymDiet AI will feature an interactive 3D gym environment using @react-three/fiber. Users will navigate through different sections of the app by "walking" through the gym. Each section, such as diet plans, progress tracking, and recipe recommendations, will be represented as different gym equipment. Users can click on the equipment to access detailed information and interact with the AI. This immersive experience will make the app engaging and memorable, encouraging users to explore and utilize all features.

Interaction Model & Motion Direction

The interaction model for the GymDiet AI landing page will be "parallax". The layered depth effect will create an engaging experience as users scroll through the app. The gym-themed UI will feature animated transitions and hover effects to enhance interactivity. Internal pages will maintain a "static" model for clarity and ease of use, focusing on data-heavy content like charts and analytics.

Non-Functional Requirements

• The application must respond to user inputs within 2 seconds.
• The AI chat system should handle at least 1000 concurrent users.
• The app should be available 99.9% of the time.
• Data privacy and security must comply with GDPR standards.

Tech Stack

• Frontend: React Native
• Backend: FastAPI
• Database: PostgreSQL
• AI: OpenAI GPT-5.5
• Authentication: Firebase Auth
• Cloud: AWS

Assumptions and Constraints

• The app will primarily target users in India, considering local dietary preferences and cuisines.
• The application will be available on both iOS and Android platforms.
• The AI model will require regular updates to improve personalization accuracy.

Glossary

• BMR: Basal Metabolic Rate
• TDEE: Total Daily Energy Expenditure
• AI: Artificial Intelligence
• GDPR: General Data Protection Regulation