Develop a comprehensive React 18 fitness exercises application with API integration in this extensive tutorial. Learn to create a modern, feature-rich app that allows users to browse over a thousand exercises, select categories and muscle groups, view exercise details, watch related YouTube videos, and explore similar exercises. Master advanced React best practices, implement a sleek user interface using Material UI (version 5), and fetch data from multiple sources using RapidAPI. Follow along as the instructor guides you through setup, file structure, component creation, data fetching, bug fixing, and deployment, equipping you with valuable skills to enhance your web development portfolio.