AI in fitness apps enhances user experience by providing personalized workout and nutrition plans based on individual data and goals. It analyzes user behavior to offer tailored recommendations and adjust routines dynamically. AI-powered chatbots offer real-time support and motivation, while machine learning algorithms predict fitness trends and user needs. Additionally, AI can integrate with wearable devices to monitor progress and detect patterns, providing insights for improving performance. This personalized approach helps users stay engaged and achieve their fitness goals more effectively.