About 70% of calorie consumption is accounted for by metabolism though the absolute number varies little for people of different metabolic rates. So, if you’re an average male whose calorie burn is 2,000 a day (can be 1,500 – 2,500 depending on height), about 1,400 are consumed just being you (brain, breathing etc). For females whose calorie burn rate is 1,600, that would be 1,200 calories. Another 400 (320 for females) or so are consumed by digestion (can be 100-800). And then there’s movin’ and shakin’ aka exercise.
Standing instead of sitting can burn an extra 50 calories an hour (10-80). So if you stand instead of sit at the desk you’ll burn maybe an extra 300 calories a day. Jogging for an hour can burn 700 calories. And running burns about twice te calories per minute of walking. Simply fidgeting will raise your metabolic rate and make a difference. If you have a physically demanding day, like cleaning, digging, building etc, you’ll be burning more calories than a desk-worker, but that doesn’t mean a bit of a workout isn’t going to help the parts of your body the daily routine doesn’t reach, like your tummy! And it’s good to breathe.