I buy this for my girlfriend , but try it out before I wrap it -lrb- mwahahahahaha -rrb- . it be actually really hard , and I be sweating quite a bit after about 6 minute . not sure what the physical result will be for she , but if she keep use it I know she 'll get better at something ... Anyways , do what it say . Shakes , be a weight , and burn calorie .