Returned Ab Twister in early March nd cannot get refubd as per their money back guarentee. Continue to call and keep getting the run around and doen't appear the refund will occur anytime soon. Their 30 money back guarentee is worthless a this has now contined to be an issue for almost 4 months. The company that seems to sponser the product is GMedia at 5959 Triumph Street, Commerce CA 90040 and the customer service number is(if thats what you want to call it) (800)457-0825. This product ws substandard and once returned, I am unable to get a refund. I would not recomend antone to buy this product or any product sold by this company.