An activity tracker motivates you to move enough and live healthily. You get insight into your heart rate, sleep, workouts, and more. These fitness trackers are small, thin bands without a screen. That way, you can stay focused on what you're doing when you're doing your job or working out. With the accompanying app, you can see all your data on your smartphone. That way, you know exactly how you perform and where you can improve. The battery life of activity trackers is at least a week, so you don't have to charge it often.