Just when you think the fitness tracker trend is slowing down, a new one hits the market. It’s likely that these personal activity tracking devices continue to do well because they make you constantly aware of how much you move during the day—or how much you don’t, which in many ways is the more telling health statistic. They coach, motivate and nag you a bit to ensure you’re taking steps, burning calories and even getting enough sleep. So which one is right for you? Read on!