WHOOP is a screenless, 24/7 wearable fitness and health tracker designed to measure sleep, recovery, strain, and stress rather than act as a real-time watch. Screenless Design: No watch face, pings, or daily distractions; all data syncs directly to the companion app. Strain: Measures the cardiovascular and physical load your body takes on from workouts, daily stress, or travel (scored from 0 to 21).Recovery: A daily 0–100 score calculated using heart rate variability (HRV), resting heart rate, and sleep quality. Sleep Tracking: Monitors sleep stages (light, deep, REM), sleep efficiency, and consistency.