Trampolines, for the briefest of moments, allow you to break an otherwise unbreakable law, unbreakable because it's a physical not prescriptive cultural law: gravity. We go higher than we otherwise would be able, we seemingly float at our apogee for a half-moment longer, and the effects on our legs of all our weight crashing down are substantially diminished. Which is a long way of trying to explain the obvious: it's simply fun.

And tempting: as the Girl hurls her feet over her head, trying, again and again, to do a full front flip and land on her feet, I think back to a time ten years ago when, visiting a friend, I bounced about on his kids' trampoline and casually landed a forward flip. Nothing to it, really. Now, I jump, jump, jump, thinking of what my body needs to do to toss my feet over my own head, and while I know all the components of the action, my body says, "Well, maybe it's not so simple..."