Vi AI Personal Trainer review: Heart rate-tracking Bluetooth earbuds with serious potential

These $250 Bluetooth earphones pack in a heart rate sensor, voice-coaching, and gorgeous Harman/Kardon sound in one lightweight package. But they’re hindered by an ultra-narrow focus on one type of exercise.

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These heart rate-tracking headphones put a fitness coach in your ear, but they’re only good for outdoor runners (for now).

It seems like every new fitness band on the market has a built-in heart-rate sensor, but now headphone companies are baking sensors into their devices, too. The ear has become a popular place to put a sensor, because properly fitting earphones will stay put and presumably measure your heart rate more accurately than a wrist-worn sensor prone to moving around during exercise. That’s why companies like Samsung, JBL, Jabra, and Bose are shipping biosensing Bluetooth earphones designed for workouts.

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