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TwitThisStep onto a Soloflex or a Power Plate, and the vibration produces contractions that lead to firmer muscles and better balance, flexibility and circulation, say the makers. Too good to be true? Rodney Corn, of the National Academy of Sports Medicine, thinks vibration can help as part of a routine. He uses a machine himself to do squats, push-ups and other moves. "Just standing on it, you'll get some benefit," Corn says. "But it's not the be-all end-all." In other words, you won't get in supermodel shape if it's your only form of exercise.
Conrad Earnest, vice president of human performance at The Cooper Institute in Dallas, is more skeptical. The platform may be an option for those who can't exercise at all, but he doubts it will do much to help the average person get fit. The only way for muscles to get stronger is through resistance training, he says. Long-term effects of these devices are unknown, and people with cardiac and other problems shouldn't even consider using one without first consulting a doctor.
Some gyms carry the machines; you can also get your own. You'll pay about $400 for a Soloflex and up to $9,250 for a Power Plate. "Madonna is doing more than just standing on the machine," says Earnest. "Is it worth paying that money instead of taking a walk? Probably not."
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