Here are the calorie expenditures for five popular machines (based on a 180-pound person working for 30 minutes at a perceived exertion between "hard" and "somewhat hard"). We got the pros and cons from John F. Graham, MS, CSCS, secretary-treasurer of the National Strength and Conditioning Association and vice president of Orthopedic Associates of Allentown (Pennsylvania), a fully equipped human performance center. Choose wisely.
