Do activities, burn calories, use them to build your own town! 
Currency of the game (calories) is given only for recorded activities. Just wearing your watch doesn't count calories in Big Town app.
I'll be glad to hear any feedback 
Link - https://apps.garmin.com/en-US/apps/c0c63c23-0d9b-485e-96f1-a5e2f256689f
