1. In a system including a computing environment coupled to a capture device for capturing user motion, a method of determining caloric burn of a user of the system, comprising: a) capturing an image of a body part of a user via the capture device; b) determining a mass of the body part captured in said step a) via a processor of the computing environment using the image of the body part captured in said step a); c) capturing a movement of the body part via the capture device; and d) determining calories burned by the body part due to the captured movement of the body part in said step c) and the mass of the body part determined in said step b).