Wrist-worn fitness trackers that monitor steps and heart rate have evolved significantly, once hailed as cutting-edge technology. Today, these wearables are increasingly high-tech, offering features like personalized workout programs and the ability to monitor stress and sleep quality. Since 2015, we’ve been rigorously testing 46 different fitness trackers while running, walking, swimming, cycling, sleeping, and more. Our assessment focused on accuracy, ease of use, and comfort. Although no tracker...