Seven Silly Fitness Fads

From strippercise to circus-trapeze aerobics, gyms and fitness gurus keep coming up with new ways to make working out less of a chore. But though these whimsical classes and instructional DVDs can reinvigorate your gym routine, some of the glitziest (and goofiest) new trends can also put you at risk for sprained ankles, pulled muscles and overexertion. And some don't even give you much of a workout.

Here are seven of the silliest fitness fads—with the lowdown on whether or not they really chisel and tone. (For other workout tips, check out our earlier story on "Six of the Worst Ways to Work Out.")

1. Weighted Hula Hooping. Maybe it was the 50th anniversary last month, or maybe it's the buzz over the new Wii Fit version, but Hula Hooping, the backyard mainstay from the 1950s, is back—and a whole lot heavier. National gym chains like Bally Total Fitness now offer hooping classes to kids and seniors alike, with weighted Hula Hoops that participants wheel around their outstretched limbs and torso.

Will the toy-based hybrid of strength and cardio give you the toned curves of Beyonce, who says she hoops to stay svelte? "The unweighted, traditional ones definitely work your core, and you can actually get the cardio system up," says Jim White, certified fitness trainer and spokesman for the American Dietetic Association (ADA). "I would recommend staying with the normal ones—with the weighted [hoops], beginners could pull a muscle."

The verdict: If you can do it, join the hoopligans. But avoid weighted hoops if you're new, and be advised of the gender divide—White says women are far more likely to be able to hoop well than men.

2. Strippercise. Toned celebrities like Kate Hudson and Carmen Electra started shilling this female-only fad five years ago, boasting both body and boudoir benefits from sensual "aerobic striptease" classes. Several variations caught on—pole-dancing classes, chair-centered lap-dance routines and floor exercises (the latter a Pilates-like workout that involves a combination of ab-stimulating moves and seductive hair-tossing). Let's forget the existential questions about whether pretending to be a stripper is empowering or degrading, can it get you in shape? "When my girlfriend first said she was going, I was kind of concerned," laughs the ADA's Jim White. "But it really increases your confidence, and you get a great workout."

However, those with weak ankles or shy spirits, beware: strapping on the eight-inch-heeled exotic-dance platforms that some classes use can result in serious injury, says Dr. Cedric Bryant, chief science officer for the American Council on Exercise. "The stiletto heels ... don't really put the foot and ankle in the most advantageous position," says Bryant. "It's part of the shtick, but purely from the biomedical standpoint, you really want to exercise caution."