Like any other deer hunter, John Porcari must drag his killed quarry out of the forest. But unlike most others, he knows just how many calories that effort takes him: 13 per minute. (That means he needs to drag a deer 12 minutes to burn off each 3-ounce venison steak he eats.) Porcari also knows the number of calories burned by a vigorous game of paintball (7 per minute), yoga (4 per minute), and sex (5 per minute).













