Interval - Ultimate HIIT Timer is a highly user-friendly AI-enhanced high-intensity interval training (HIIT) tool, designed to be used on various Apple devices such as the iPhone, iPad, and iPod touch. The application facilitates the creation, customization, and execution of interval workouts specific to a user's preferences and fitness level. It comes with an array of features including pre-Loaded Workouts, which allows users to immediately start their fitness routines from a set of predefined routines aiming at specific fitness goals such as weight loss, muscle toning or targeting specific muscle groups. A distinct feature is the AI-Generated Workouts, which creates personalized routines based on a user's unique goals, preferences, and fitness level. The application also offers Customizable Timers, allowing users to tailor work and rest intervals, repetitions, warm-up and cool-down periods to their specific needs. To improve user focus and motivation during exercise, the app provides Audio and Visual Cues, which guide users through each interval by indicating when to work, rest or change exercises. Interval workout results can be shared with friends, family, or workout partners to motivate and inspire each other. This tool is suitable for fitness enthusiasts at every level, from beginners to seasoned athletes.