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You show your member card of your fitness club to the audience and explain that you hate to go there. The card is inspected by the spectators and then instantly changes into a coupon card of a fast food restaurant!
That's way better than working out, you state. But to feel better you'd have to go to the gym again. Speaking so, the fast food coupon within the blink of an eye changes back into your fitness club card! The card is then handed out for examination.
Easy to do!
Resets in seconds
Highly visual magic!