This is what two of my children do when my back is turned! See that big yellow exercise ball in the background? My husband and I bought that for ourselves - but it has become one of the favourite toys for my 11 and 8 year olds. They balance on it and bounce off it and now........do stunts off it onto my bed. They got hold of our digital camera, set it to "action shots" and hey presto....impressive, eh! Unfortunately, it makes a hell of a mess of my bed.