Why am I getting exercise credit for non-exercise activity?

[iMore Question]

I've had an AW Series 2 for about a week and my exercise ring consistently fills up for non-exercise activity, such as just walking around the house or office. Sometimes, by the end of the day, I have 20 minutes of exercise credit - none of it for true exercise. Does this happen to anyone else?

 

[Just_Me_D]

"As with anything, what the Apple Watch considers as exercise will vary from person to person. Someone who isn't very active will earn exercise for doing things out of the ordinary like going on a long walk. Someone who regularly walks and hits 12,000 steps a day will need to do more than that. Your Apple Watch learns your habits quickly and will want you to push yourself to earn anything extra."

Source: http://www.imore.com/apple-watch-activity-tracking-5-tips-you-need-know