Two questions:

-How would you figure/estimate calories burned while lifting?

-How would bodyfat% affect someone's calculated bmr? i.e. when you put in your info into a bmr calculator, bodfat% isn't accounted for. I would assume that someone 200lbs at 5% bodyfat would burn more calories/day than someone at 200lbs/15% bodyfat. Or is this negligible?