HIIT LEADER is a free iPhone app developed by Atsushi Kotaka, categorized under Lifestyle > Health & Fitness. It serves as a simple timer for High Intensity Interval Training (HIIT) and Tabata workouts. The app features a flexible menu, allowing users to customize their workout routines based on their fitness level and goals. With a smart design incorporating newmorphism, users can choose from 7 theme colors for a visually pleasing experience. Additionally, the app offers a convenient YouTube save function, enabling users to watch workout reference videos within the app and add their own favorites.

Please ensure to exercise in a safe environment and within your capabilities while using this app.