Apple introduced Workout Buddy, an AI workout coach, at its WWDC 2025 conference.Workout Buddy collects data from current workouts and fitness history to coach users in real-time based on various metrics.The AI tool uses a generative voice, created from Fitness+ trainers' voice data, to provide encouragement during workouts.Users can choose from multiple voices, get real-time updates during workouts, and receive personalized feedback at the end of the session.