These are only bad for you.

After walking hundreds of miles (3 miles a day for 5 days a week, for an entire year) all they did was hurt my ankles. They are awkward, uncomfortable, and make you feel like Frankenstein if you are tall (O'm 6'6"). They did nothing to "tone" my bottom, legs, thighs, or quads. They only hurt my legs.

Do. Not. Buy.