If you're falling for the infomercials advertising the "Shake Weight," a spring-loaded dumbbell that you shake when performing standard upper body exercises, don't expect big results. In the recommended six-minute-per-day workout, you aren't burning many calories. Furthermore, the weight weighs just 2.5 pounds -- not enough to elicit noticeable strength gains.
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The makers of the Shake Weight claim you can tone your upper body in just six minutes. If you use the standard 2.5-pound version, or even the heavier 5-pound version made for men, you may classify it as light weight training.
A 155-pound person burns just 112 minutes per 30 minutes of this activity, or just shy of four calories per minute. In the six-minute workout -- you burn about 22 calories. For people who weigh less, the burn rate is less -- for example a 125-pound person burns just 18 calories in those six miracle minutes. Larger people burn more calories, but not enough to make a significant dent in your metabolism.