A few years ago, fitness trackers were the simple gadgets that counted steps and buzzed when you sat for too long. Today, they do much more. Smartwatches now track your sleep, stress levels, heart rate variability, recovery, oxygen levels, calories b...

There are times when you wake up feeling refreshed. The sun is peeking through the window curtains and your mind feels fresh. But before you swing your legs out of bed, you check your wrist. Your sleep score is a 62. Suddenly, that phantom energy van...

Think about it, you wear your smartwatch or fitness band and never think about it again for several days. You don’t have to remember to charge your gadget every night, nor get notifications about its lack of battery when you go jogging or during your...