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Working hard doesn't consume many calories, as far as I know.

There's some extremely cases like training for the Olympics or body building, but overall, peoples energy usage is pretty similar

That contradicts everything I've ever heard. It varies by both activity level and weight of the person in question.

Yes, and it varies immensely by amount of activity.

I add at least 1500-2000 calories a day when I am lifting in addition to normal training (as in, 1-2 hours of intense exercise every day).