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Ever wonder what your heart rate is when you’re running while listening to music? The ear provides a great platform for doing this kind of biometric measurement. Earbuds, rather than watches, tend to be the most accurate heart-rate monitors on the market, outperformed only by traditional chest straps.

Essential reading: Smart earbuds – top biometric headphones

Headphones are also great for people who work out and want to check their steps, distance traveled, and calories burned, among other information.

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