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New A.C.E. study finds that some toning shoes yield insignifant results and recommends adding weight instead. Hello NGR!

A study commissioned by the American Council on Exercise, the nonprofit body that certifies fitness professional, finds that some toning shoes have the same impact on heart rate, VO2 Max, and calories burned as regular running shoes. What do they recommend to instead to "Rev Up Your Walking Workout"? Basically carrying extra weight. Read below: