Plantronics BackBeat FIT 2100 Review: Our Favorite Workout Headphones

In high school, my cross-country coach once counseled me to open my clenched fists. Stay relaxed, he said. The energy that you use to clench your fists is energy that you need for running. To this day, every time a shirt rides up or a shoe comes untied, I shout, “Noooo! I need this energy …

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