I used the bender ball with a personal trainer at the gym and wanted one for home. My local sports store did not carry it, so I ordered over the internet. I either did not notice or forgot about the subsequent DVD shipments automatically charged to my credit card. I kept the first set of DVDs and cancelled. I do actually use the DVDs and am frankly glad to have them, but I prefer to buy DVDs when and if I want them, and not have them automatically sent and billed to me just because I bought a product.