WHOOP 4.0

WHOOP 4.0 is a screenless fitness wearable that provides 24/7 monitoring of heart rate, sleep, and recovery. It's designed for continuous wear and uses advanced sensors to track physiological data throughout the day and night. For caregivers, WHOOP offers valuable insights into a loved one's recovery status, sleep quality, and overall strain levels. The recovery score helps identify when someone may be overexerting themselves or not getting adequate rest. Key features include: - Continuous heart rate monitoring - Sleep tracking with sleep stages and sleep debt analysis - Respiratory rate monitoring - Blood oxygen (SpO2) tracking - Strain coaching to optimize activity levels - Recovery score based on HRV, resting heart rate, and sleep Note: While WHOOP tracks HRV internally, it uses RMSSD calculation which doesn't sync to Apple Health (which uses SDNN). Heart rate, sleep, blood oxygen, and respiratory rate do sync.