Did some yard work for 2 hours, I am exhausted; I am not in shape and heart beat was pretty high. As a result, 20 calories added to my activity. Been resting on the couch for 30 minutes, just added 50 calories to my activity... Driving to work usually gets me about 30-50 calories; similar for sitting at desk. Remember, we're not talking about resting calories, but moving ones. Having two devices on me (iPhone+Watch), on wrist and in pocket, combining multiple accelerometers, heart monitor, barometers and a GPS, etc... you would expect those devices would work together to figure out if you're driving or if you're laying down in bed, more accurately than the $30 activity trackers out there, but that doesn't seem to be the case I was really hoping the activity tracker alone would justify buying the watch, but it's not any better (if not worse) than the cheapest options out there.