Watches.

If we wear a Suunto, Garmin, Apple watch or Fitbit the device wants us to wear it for sleep, for every step we take, every heart beat and more. At the end of the year we do get fitness summaries but related to what we ran, swam, cycled and possibly walked. That means that for 22 hours a day we are tracking our heart rate and more for nothing. With fitness watches if we track walking and hiking there is a good chance that the end of year summary will ignore these activities.