Created in 2012 by a Harvard squash team captain, this wearable device records heart rate, ambient temperature, and motion at over 100 times per second and transmits the data to a connected app to measure an athlete’s strain, recovery time, and sleep habits. The data is then analyzed to help suggest when a user is training too hard, not resting long enough, adding physical stress by traveling, and recognizing when ingesting caffeine or alcohol might affect their recovery.