Metabolic flexibility is a buzzy topic, particularly among biohackers--people who use themselves as an experiment in an effort to be healthier or perform better. Being metabolically flexible means ...

While fitness trackers have been around for years, the events of the past year or two have only served to make people more acutely aware of the state that their bodies are in. The assortment of ...

It’s been two years since the pocket-sized Lumen metabolic analyzer launched with a thoughtful iOS app and Apple Health integration. Over the last month, I’ve been using the device again to test out ...

If you like to use your iPhone and Apple Watch as part of your health and fitness journey, odds are good you value all the data they can offer. While that can include ways to track calories burned and ...