LANGLEY AIR FORCE BASE, Va.-- Anne Jennings, Health and Wellness Center health fitness specialist, reads data from a Bod Pod test that Senior Airman Sylvia Olson, 633d Air Base Wing Public Affairs journalist, took part in March 9. The Bod Pod measures body mass, or weight, and body volume using air displacement technology. Using these two variables, body density is computed and used with an equation to provide body composition information. (U.S. Air Force photo/Senior Airman Dana Hill)