No. 3: Electric ab belts
You want a quick fix with minimal effort? The Hawaii Chair has nothing on ab belts, which again promises the benefits of exercising without all that nasty, sweaty exercise.
The belts claim to use electrical impulses to make your abdominal muscles contract, squeezing hundreds of sit-ups in just minutes. Sounds great, right?
The problem is you can't burn fat by just making your muscles twitch for a few minutes.
A University of Wisconsin-La Crosse study in 2002 found that even after eight weeks such machines produced "no significant changes in weight, body-fat percentage, strength or overall appearance."
And while some electrical muscle stimulators have actually received FDA approval, most of them were designed for medical rehabilitation and require a prescription.
The bottom line? The small print in ab belt ads suggest combining the belt with good old-fashioned exercise and eating right. Go ahead and try that, minus the belt.
No. 2: The Ab Rocker
When you spend your hard-earned money on exercise equipment, you generally want one that will show results, right?
So why buy a product that's actually shown to be less effective than simply exercising without the pricey equipment? Ab Rocker users, care to field that one?
The Ab Rocker, a machine designed to work your abdominals through a rowing-like rocking motion, does provide some benefits. However, a San Diego State University study ranked it dead last in a test of 13 abdominal exercise products, branding it 80 percent less effective than the traditional abdominal crunch.
Fellow ab exercise machines the Ab Roller and the Torso Track performed a little better, but still were not much better than the basic crunch.
The results support the American Council on Exercise's stance that it's not necessary to spend big bucks on ab exercise machines. Instead, ACE recommends that if you are going to invest in a piece of equipment, make it a high-quality exercise ball.
No. 1: ThighMaster
If you watched TV at all in the 1990s, it was nearly impossible to avoid Suzanne Somers -- and we're not talking "Three's Company" re-runs.
The idea used to sell the ThighMaster was simple: If Somers has great legs and she uses the product, it must work.
Just one look at Somers' thighs, or watching the men in their lives paying a little too much attention to her infomercials, was enough to send women scrambling for the phone and their credit cards.