The Whoop Strap is a fitness tracker designed to monitor various aspects of health and performance. It focuses on three main metrics: heart rate, sleep quality, and recovery. By collecting data continuously, it helps users understand their physical condition and optimize their training routines. The device is worn on the wrist and does not have a screen, relying instead on a companion app for data analysis. Users can track their progress over time, set fitness goals, and receive personalized insights to improve their overall well-being and athletic performance.