According to a new study out of the University of Sydney in Australia, SHIVERING for 10 to 15 minutes burns as many calories as an HOUR of moderate exercise! They found that being cold and working out both produce something in your body called "brown fat" . . . which is a good kind of fat that burns calories. 'Bad' white fat stores energy - while 'good' brown fat burns it up! 50 grams of brown fat can burn up to 300 calories per day, the same amount of energy stored by 50 grams of white fat!