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+# Development Plan: Exercise Diary
+
+## Overview
+A desktop GUI application for Linux (CachyOS) to track workout sessions, exercises, and body metrics (weight, etc.).
+
+## Technology Stack
+*   **Language:** Python 3
+*   **GUI:** `customtkinter` (Modern, clean, supports dark mode - similar to your Video Converter project).
+*   **Database:** `SQLite` (Lightweight, local file storage, no server setup required).
+*   **Plotting:** `matplotlib` (For visualizing progress/weight trends).
+
+## Core Features (MVP)
+1.  **Daily Health Log:**
+    *   **Sleep:** Duration (hours) and Quality (1-10 scale).
+    *   **Body:** Weight and Waist Circumference.
+    *   **Wellness:** Mood/Energy levels.
+2.  **Calisthenics Tracker:**
+    *   Focus on bodyweight exercises (e.g., Pushups, Squats, Planks).
+    *   Track Reps, Time (for statics like Planks), and Difficulty/Variation (e.g., "Knee Pushups" vs "Standard").
+    *   RPE (Rate of Perceived Exertion) to track effort as strength increases.
+3.  **Motivation & Gamification:**
+    *   **Streaks:** Visual indicator of consistency.
+    *   **Progress Graphs:** Weight vs. Waist, Sleep Quality vs. Mood.
+    *   **"Level 0 to Hero":** Simple milestones to acknowledge starting from a sedentary lifestyle.
+4.  **Exercise Library:**
+    *   Pre-loaded with basic calisthenics moves.
+    *   Ability to add custom exercises.
+
+## Proposed File Structure
+```
+ExerciseDiary/
+├── main.py           # Entry point
+├── database.py       # SQLite handling (Daily logs + Workouts)
+├── models.py         # Data classes
+├── assets/           # Icons or motivational images
+├── ui/
+│   ├── app.py        # Main GUI window
+│   ├── daily_log.py  # Quick entry for Sleep/Weight/Waist
+│   ├── workout.py    # Calisthenics logger
+│   └── stats.py      # Motivation & Graphs
+├── requirements.txt  # Dependencies
+└── README.md
+```
+
+## Next Steps
+1.  Initialize the project environment (virtualenv).
+2.  Install `customtkinter` and `matplotlib`.
+3.  Set up the database schema.
+4.  Build the basic GUI shell.