One of Margaret and Ellie's favorite pastimes at the moment involves playing a game called "jump fort" which involves removing all of the cushions from the couches in the living room (heaven forbid that one of the adults in the house dares to sit on the couches; that's not why they are there) and jumping on them. They usually just pile them, but the other night Ellie came up with a game that she called hotscoptch. I think it must be related to hopscotch, in that it sounds like it, and is somewhat linearly organized, but really, it just involves her running up and down on a row of cushions.
I'm sure that this is contributing to the length of the couch's life. At any rate, they seem to enjoy it very much, and it's mostly harmless.