You have seen the TV ads with the young girl showing off her shapely rear end due to the EasyTone walking shoes that she is wearing. This is the subject of the NY Times article titled " Firm Body, No Workout Required? "
According to the article, the shoes work by creating the sense of instability in a similar way that an exercise ball does. To remain stable, you have to work your leg muscles harder. The EasyTone shoes appear to work the gluteal muscles about 28% more than regular shoes, and the hamstring plus calf muscles about 11% harder.
Charles
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