At my weight (175 pounds) going 10k over an hour puts me at about this amount of calories. That’s 6.2 miles. I am in no way fit enough to be able to go that kind of distance, forget about the pace, which is sad to admit.

At a 15 minute mile, I would burn 120 calories/mile.

That’s not to say that you can’t burn significant calories exercising, it’s just that your average couch potato won’t be able to out of the gate. It’s far easier for me to reduce my intake by 120 calories/day than it jog a mile a day on average. Ideally you would do a bit of both.