Two-minute reviewAre you currently burning carbohydrates or fats? Lumen, a small breathalyzer equipped with Bluetooth to sync with an app for smartphones and Apple Watch, will tell you. It’s still a novelty in the fitness sphere, but it’s a tool that will work very well for some users, while others will forget about it and leave it in a drawer. Why do you need to know? Because Lumen tells us our body’s metabolism is so important, and it’s right.
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