In a 2019 study, 18 senior citizens took a stroll on some treadmills while armed to the hilt with fitness trackers. They had devices strapped to their wrists and ankles, fastened to their belts, and wrapped around their chests. But even with all these trackers, the seniors couldn’t get an accurate step count because their movements were too slow to trigger the sensors in the devices. Commercial fitness trackers are being used for all kinds of things other than tracking steps. They measure heart rate, track sleep patterns, and calculate basal metabolic rate and calories burned. They’re used in clinical… This story continues at The Next Web