By JAN JARVIS There’s a hot vibrating training machine on the market, and it’s shaking up everyone from Madonna to the Mavericks. The Power Plate promises to tone muscles, improve strength and increase flexibility with just three 15-minute workouts a week. At 20 to 50 vibrations a second, it shakes up the entire body, causing all those muscles to contract at lightning speed. Spending 15 minutes …
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