System Requirements Document (SRD)

Project Name: sunny-calisthenics

1. Introduction

Welcome to the System Requirements Document for sunny-calisthenics, a futuristic fitness application designed for users in the United States. This app combines calisthenics, weighted exercises, injury-friendly chair workouts, and meal planning to cater to a wide range of fitness levels and goals. With a focus on accessibility and affordability, sunny-calisthenics offers a 14-day free trial followed by a small monthly subscription fee, ensuring users can experience its value before committing.

This document outlines the system requirements for sunny-calisthenics, including functional and non-functional specifications, user personas, design concepts, and technical considerations.

2. System Overview

The sunny-calisthenics app is a fitness platform tailored for at-home workouts. It provides:

• Calisthenics and weighted exercises for all fitness levels.
• Chair exercises for users with injuries or mobility challenges.
• Meal plans to complement fitness goals such as weight loss, strength building, or general wellness.
• A free trial period of 14 days, followed by a small monthly subscription fee.
• Futuristic neon aesthetic to inspire and energize users.

The app aims to deliver a seamless and personalized experience, blending structured recommendations with an extensive library of workouts and meal plans.

3. Functional Requirements

As story points:

• As a User, I should be able to access single at-home workouts for all fitness levels, including calisthenics and weighted exercises.
• As a User, I should be able to access chair exercises designed for injury recovery or mobility challenges.
• As a User, I should be able to view and follow meal plans tailored to fitness goals.
• As a User, I should be able to explore a library of workouts and meal plans.
• As a User, I should be able to receive personalized workout and meal recommendations based on my fitness goals.
• As a User, I should be able to sign up for a 14-day free trial.
• As a User, I should be able to subscribe to the app for a small monthly fee after the trial period.
• As a User, I should be able to track my progress over time (e.g., workouts completed, meals followed).
• As an Admin, I should be able to manage workout and meal plan content.
• As an Admin, I should be able to monitor user subscriptions and trial periods.
• As a User, I should be able to trigger selective re-run capability to regenerate specific SRD sections.

4. User Personas

1. Beginner User

• Description: New to fitness, looking for simple and accessible workouts and meal plans.
• Goals: Build a foundation of fitness and healthy eating habits.
• Needs: Easy-to-follow instructions, injury-friendly options, and progress tracking.

2. Intermediate User

• Description: Has some fitness experience, seeking structured workouts and meal plans to enhance performance.
• Goals: Improve strength, endurance, and overall fitness.
• Needs: Personalized recommendations and a variety of workout options.

3. Advanced User

• Description: Experienced fitness enthusiast, looking for challenging workouts and detailed meal plans.
• Goals: Achieve specific fitness milestones (e.g., muscle gain, weight loss).
• Needs: Advanced workout routines and detailed nutritional guidance.

4. Injury Recovery User

• Description: Recovering from an injury or dealing with mobility challenges.
• Goals: Maintain fitness while accommodating physical limitations.
• Needs: Chair exercises, low-impact workouts, and supportive meal plans.

5. Visuals Colors and Theme

Color Palette:

• Background: #0A0A0A (Deep Black)
• Surface: #1F1F1F (Charcoal Gray)
• Text: #E6E6E6 (Bright White)
• Accent: #FF00FF (Neon Magenta)
• Muted Tones: #00FFFF (Electric Cyan)

Theme:

The theme is inspired by neon lights and futuristic vibes, reflecting energy, boldness, and innovation. The colors evoke a sense of excitement and motivation, perfect for fitness and wellness in a modern, tech-forward context.

6. Signature Design Concept

Neon Fitness Universe

The homepage will feature a futuristic neon fitness universe that immerses users in a glowing, interactive environment.

Key Features:

• 3D Animated Galaxy: The homepage will display a galaxy of glowing neon planets, each representing a feature of the app (e.g., workouts, meal plans, progress tracking).
• Interactive Planets: Users can click on planets to zoom in and explore their contents. For example, clicking the "Workout Planet" reveals a rotating 3D dumbbell surrounded by glowing rings.
• Dynamic Color Shifts: The galaxy will pulsate with neon colors that shift based on the user’s activity (e.g., completing workouts or meal plans).
• Micro-Interactions: Hovering over planets will trigger animations like orbiting stars or glowing trails.
• Glassmorphism Elements: Menus and pop-ups will feature translucent, frosted glass effects with neon highlights.

This design concept ensures the homepage is visually stunning and deeply engaging, creating a memorable first impression that motivates users to explore and achieve their fitness goals.

7. Non-Functional Requirements

• The app must load within 2 seconds on standard broadband connections.
• The app must support accessibility features, including screen readers and adjustable text sizes.
• The app must be compatible with both iOS and Android platforms.
• The app must ensure data security and privacy, adhering to GDPR and CCPA standards.
• The app must handle up to 10,000 concurrent users without performance degradation.
• The app must support selective re-run capability for regenerating specific SRD sections.

8. Tech Stack

Frontend:

• React for Web
• React Native for Mobile

Backend:

• Python
• FastAPI

Database:

• MySQL for relational data (e.g., user profiles, subscriptions)
• MongoDB for workout and meal plan content

AI Models:

• GPT 5.4 for user-friendly responses and recommendations
• Claude 4.6 Opas for coding and academic tasks
• Google Nano Banana for generating meal plan visuals

AI Tools:

• Litellm for LLM routing
• Langchain for AI workflow integration

Orchestration:

• Docker and docker-compose for local development
• Kubernetes for server-side orchestration

9. Assumptions and Constraints

Assumptions:

• Users will have access to basic fitness equipment (e.g., dumbbells, resistance bands).
• Users will have internet connectivity to access app features.
• The subscription fee will be affordable for the target demographic.

Constraints:

• The app must comply with US-based fitness and nutrition guidelines.
• The app must operate within the constraints of mobile device performance.

10. Glossary

• Calisthenics: Bodyweight exercises designed to improve strength and flexibility.
• Chair Exercises: Low-impact workouts performed while seated, suitable for injury recovery.
• Meal Plans: Structured dietary recommendations tailored to fitness goals.
• Free Trial: A 14-day period during which users can access app features without payment.
• Subscription Fee: A small monthly payment required to continue using the app after the trial period.
• Selective Re-run Capability: A feature allowing users to regenerate specific sections of the SRD on demand.