What it is: WHOOP is a futuristic wearable that measures heart rate, heart rate variability, ambient temperature, and motion to determine an athlete's strain and recovery. According to information on the corporate website, users build better sleep and lifestyle habits, reduce their resting heart rate, increase their heart rate variability, and have fewer injuries

Who uses it: Connor Jaeger, U.S. Olympic swimmer, Adeline Gray, U.S. Olympic wrestler, and NBA star Kyle Lowry wear WHOOP. Legends LeBron James and Michael Phelps also reportedly use WHOOP, according to a recent Fast Company article.

The science: WHOOP has published a number of case studies and white papers on the wearable's impact on behavior, research on heart rate variability, the link between sleep and athletic performance, and the importance of an objective measure of strain.

The testimonial: "I was completely unaware of how much travel and crossing time zones was affecting my body. Wearing WHOOP has allowed me to adjust my training plan to ensure I'm always ready to perform when it counts,"--Connor Jaeger, in a quote cited on the company's website.

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