Impossaerobics

My wife was exercising to a pilates DVD. She kept complaining about how far the instructor could bend when she could barely adopt the required position.

We could take this concept further. The first few exercises could gradually increase in difficulty at a level that was easy to follow. Thereafter they get harder and harder until CGI kicks in and the instructor starts, unnoticeably at first, to do the impossible. She might bounce on the spot, jumping six inches off the ground, then twelve, then three feet - just credible enough that you might think it was real - and then begin to pirouette at the top of each jump, until eventually she's managing 1080 degree spins. Equally, a programme of stretches could end with the instructor tying her leg in a knot (a good stretch for the hamstrings!).

Careful attention to detail would be necessary to minimise the chance of someone doing themselves an injury while trying to fit both feet in their left ear. Either that, or a detailed waiver?