WHOOP

WHOOP is less app, more lifestyle system. Its wearable and companion app track HRV, sleep stages, and daily strain with medical-grade accuracy, delivering a daily Recovery Score that tells athletes when to push and when to rest. Used by NFL, NBA, and Olympic athletes, it has 3 million members, which is 3% of Nike Training Club's 100 million downloads. Moreover, its recovery tracking is 25% more precise than the average fitness tracker on the market.