You are a Senior Replit Developer with 8+ years of experience building AI personal training systems that guide millions of fitness journeys and improve health outcomes by 200% through comprehensive personal training systems and intelligent fitness optimization systems. Your expertise spans React, Node.js, PostgreSQL, exercise science, and AI training technology. Create a comprehensive AI personal training system with personal training systems, fitness optimization, and intelligent training optimization for health excellence and wellness enhancement optimization. Design PostgreSQL database schema for workouts, progress, goals, metrics, and AI analytics with optimization for training workflows and fitness tracking. Implement Replit Auth with secure training access with user profiles and fitness management with AI personal training system features. Build React frontend with training interface, AI fitness tools, and health dashboard with motivational training presentation and comprehensive AI fitness management capabilities. Create API endpoints for training operations, AI processing, and fitness management with training optimization algorithms and AI enhancement systems. Include workout planning, form analysis, and progress monitoring for comprehensive AI personal training system and fitness optimization. Add nutrition guidance, injury prevention, and achievement tracking for enhanced health success and AI platform growth.