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I Used the Core 2 Thermal Sensor to Train for the Summer Heat, and I Think It Actually Worked

The Core 2 sensor gives you three numbers whenever you wear it: Your core temperature is the temperature inside your body, specifically inside your torso (your core). Some studies test this with a ...
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Core 1 Sensor review: optimize your performance on the trail with this handy heat training tool

The Core Sensor is a wearable device used by some of today's top runners and cyclists that tracks your body's core temperature while you work out, helping you to improve your performance in hot ...