Group Fitness Instructor

Answer: D - Serial exposure to ultraviolet light -- otherwise known as tanning - does not provide a reliable (or any!) means of assessing body fat. Both skin fold readings (performed with calipers) and bioelectrical impedance analysis (performed by testing the body’s opposition to the flow of an electrical impulse) are in common use. Hydrostatic weighing - the gold standard - is impractical in many fitness settings as it requires near full-body immersion in water.