Remember those silly-looking vibrating-belt machines that
pledged to giggle you thin? Maybe they weren't such a joke.
"Whole body vibration" is winning fans at the gym, including
big names like Lance Armstrong and Gwen Stefani.
Sleeker than the old units, new ones from Power Plate and
Orthometrix work on the same principle: Involuntary muscle
contractions may boost strength, blood flow, and flexibility. To
date, there's little science behind it. Is it just us, or does this fad
seem a bit shaky?