Seven Silly Fitness Fads

6. Wii Fit Ski-Jump. Some of the applications for Nintendo's latest gee-whiz gadget are gathering a cultlike following for their fitness-is-fun virtual workouts, all centered on a floor pad that senses your movement. The "Two-Person Run" lets you jog around a lush digital island, for example, without leaving your living room, and White says it's very popular with his clients. But others, like "Ski Jumping," require extra vigilance to get the full fitness payoff—meaning, holding the poses for the right amount of time and managing your breath correctly. Marked as a balance-improver, the ski jump requires the jumper to remain in a slight squat position for a few seconds before quickly straightening up. But White says: slow your release in any squat to get the toning payoff. "Make sure you're not holding your breath, and hold the release for anywhere from four to five seconds," he says. The other requirements? Ponying up the $90 for the Fit (plus about $250 for the Wii console).

The verdict: Wii workouts can be virtually sweat-free, but hold it right, and you could improve your rear view. Click here to watch NEWSWEEK's Brian Braiker give Wii fit a whirl.

7. Dorm Room Workouts . College-geared fitness guides like "Dorm Room Diet Workout," by Daphne Oz (daughter of oft-quoted health guru Dr. Mehmet Oz) say the freshman 15 is an elective, not a requirement—and with just 20 minutes of milling around your 9-by-10-foot room, you can stave off the creeping pudge. But when just about every college in America has a gym, why do pushups under a backpack of textbooks? Lack of time, says Oz, whose 20-minute fitness DVD shows a series of room-based stretches and leg lifts that profess to be a shortcut to a toned physique.

But by itself, it's not enough, says Bryant. A Cornell study of college diets suggests that freshman gain over a third of a pound per week during their first semester—meaning a calorie intake that commercial-break chair dips alone won't cancel out. "You can't spot reduce, and everything has to be combined—cardio, weight training and the proper diet," says White. "That's the bottom line with respect to all of these fads—it comes down to hard work."

The verdict: 20 minutes alone in your room won't justify pizza and beer—or win you lasting college memories. But when combined with other healthy habits, it earns high marks.

© 2008