A cat may be trained to do tricks such as playing dead or ringing the doorbell.[17] Because of the cat's flexibility and bone structure, they are able to twist and bend their bodies, and jump a fair distance from standing still.[18] This talent can be turned into tricks involving jumping through hoops and off scratching posts.[19] Cats are able to learn many types of commands,[4] such as to come when called, sit, roll over, shake a paw, and jump.[5]