Apnea Trainer is an iPhone application designed for individuals looking to improve their free diving capabilities. It utilizes a training principle derived from yoga techniques to strengthen diaphragm muscles, allowing users to increase their underwater endurance significantly. By training just three times a week, users can expect to double their free diving time, making it ideal for both beginners and experienced divers. The app also features a pranayama mode, which aids in calming the body before diving, ensuring a more relaxed and enjoyable underwater experience.

The application offers customizable time settings suitable for professional divers, along with optical and audio instructions to guide users through their training sessions. The user-friendly interface makes navigation straightforward, allowing divers to focus on their breathing exercises. With its effective training methods and intuitive design, Apnea Trainer stands out as a valuable tool for enhancing free diving performance.