Does the Shake Weight work?

According to WebMD, the Shake Weight does not provide enough resistance to stimulate muscles in the same way as workouts that utilize traditional dumbbells. Therefore, the Shake Weight does not work as a viable substitute for a real workout.

The Shake Weight comes with a DVD that instructs participants on exercises that target specific body parts. Each of these exercises last approximately 20 to 30 seconds. The DVD also gives instructions for active recovery between sets with the Shake Weight. The exercise routines with the Shake Weight are relatively short, and because the device is easy to transport, working out with it can be completed anywhere at anytime.