Meet the WHOOP Strap 2.0: a smart wearable device that is being used to help NFL players monitor their strain and recovery. This is a waterproof, lightweight device that is worn on the wrist, forearm, or upper arm. It uses 5 sensors to measure data 100 times per second.
WHOOP automatically measures your physiological markers to determine your readiness to perform each day. The device also tells you how much sleep you need to recover.