You've seen it on TV--The AB Energizer. It's a belt that uses something called Electronic Muscle Stimulation to exercise your abdominal muscles while you sit down and relax. The advertisements show people wearing the belt with sculpted, well-defined abs. You're supposed to start feeling the difference within days and the company says you should "see a difference in 4 to 6 weeks." The belt's electronic pulses are supposed to make this all possible without the sweat and exercise. The makers say it's based on technology that's been around for about 30 years.