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Widely available at health clubs; takes a few minutes Bioelectrical Impedence Test You lie down, a technician attaches electrodes to one hand and one foot, and a harmless radio-frequency pulse is run through the features body to measure its water content. That number provides a guide to body fat with an error of 2 features or 2 1/2 percentage points. But exercise and liquid intake before the test can skew results. features Takes only a few minutes; found at health clubs and sports medicine clinics Immersion Test So far the "gold standard" of body-fat measurement, this test requires you to expel the air from your lungs and get dunked into a pool–half a dozen times. It under- or overestimates body fat by only 1 percentage point. Available at many hospitals and some gyms, but it is gruelling and can last an hour Bod Pod An egg-shaped chamber that offers precision without pain. You step in, sit for 20 seconds, and that's it. The chamber measures air displacement, which can be converted to relative fat when weight is factored in, since muscular people are denser.
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