1. When you do not start and end your workout session on your device.
  2. When you start your workout session and forget to end it or end it hours after you have completed your workout as we will pick up passive calories when your workout stops.
  3. When you start a workout session on your device and leave it on for the whole day without actually performing a workout. So even if you burn 300 calories in this time, these will not be taken into account as they are passive calories, and not active (workout) calories.