Want to leverage wearable tech like a World Cup athlete? Here are the metrics to track

Want to leverage wearable tech like a World Cup athlete? Here are the metrics to track
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By Jacqueline Howard and Andrew Quimby, CNN (CNN) — Millions of people around the world wear smart rings and fitness trackers to keep tabs on their sleep, workouts, heart rate and even body temperature, all in the name of better understanding their health. But at the World Cup, that same techno...