Whoop, which tracks a wearer’s vital signs, is being used by tech-minded guys to keep tabs on their buddies.
Like other single guys his age, Mack Knight, 40, a software company executive in Los Angeles, has a crew of buddies who like to explore the city, travel and workout together.
They take their exercise seriously: Each wear a fitness tracker called Whoop that monitors their body’s vital signs (including heart rate, breathing and sleep), and makes that data shareable through an app.
The other week Mr. Knight was reviewing his Whoop statistics when he noticed that one of his buddies, a friend from business school, was missing his daily workouts. “That was
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