Sitting in a chair for too long is not very healthy. Besides burning fewer calories and leading to weight gain, it also can have negative impacts on your cardiovascular system. The idle time you spend sitting in a chair (Sedentary Minutes) is something we track in the Sensable Health program through related Goals in the Activity Domain. Your smartwatch helps us understand how long you are active and how long you are sedentary. Note that if you don't wear your smartwatch, certain devices may think you're sitting.