If Skechers Shape-ups can tone your legs when you walk, why not wear them to the gym for even more toning? Injury is why. The very characteristic of these shoes that the manufacturer claims makes them effective is the same characteristic that can cause serious injury if you use the shoe incorrectly.
Toning Shoes
Toning shoes are basically sneakers with an unstable sole. Skechers Shape-ups have a sole molded into a convex arch that forces you to exert more force to push your foot through the normal roll-through range of motion in every stride, while other types have large air bubbles at different points to add instability. Shape-ups also include about an inch of cushioning in the midsole, which makes them feel different than regular sneakers. The cushion factor alone is enough to make some people want to work out in them.
Claims
The makers of toning shoes claim that the instability introduced by the irregular sole engages tiny auxiliary muscles that work to keep your foot pointing in the right direction as you walk. Skechers Shape-ups in particular, because of the curves sole, are purported to tone your calves and butt by forcing you to begin every step with your heel much lower than your toe -- think of doing calf raises with your heels hanging off a step. Many people think that if the shoe alone can cause that much toning, then wearing them during a workout can increase the results dramatically.
Reality
In reality, not only do toning shoes not cause muscle development, they can be dangerous during a workout. According to the American Council on Exercise, studies have shown that there is no extra muscle activation with toning shoes as opposed to regular running shoes. Any benefits users might see are the result of increased physical activity. Wearing them to run, walk or even lift weights presents a clear opportunity for injury, as all of these activities require careful foot mechanics and steady balance. The instability introduced by the shoe can easily throw you off balance or cause you to fall off of the high sole sideways, resulting in serious injury. Lifting weights while wearing the shoes can cause you to shift your body weight at an inopportune time in an attempt to stay upright, and throw off the alignment of the exercise, resulting in pulled muscles, ligaments and tendons. The American Podiatric Medical Association warns against wearing them during extended periods of exercise because of this risk of injury.
Alternatives
If you're convinced that your Skechers Shape-ups are working for you, save them for regular walking-around activities like shopping or errand-running. Stick to sport-specific shoes for workouts so your feet are cushioned and supported appropriately for your activity. Running shoes have the cushioning to protect you from running impact; basketball shoes have the ankle support necessary to protect you during jump shots; soccer cleats help you keep traction on turf; and cycling shoes have rigid soles to prevent foot strain while pedaling. Cross-trainers provide cushioning, stability and a wide base of support for general gym workouts.
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