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Maybe GIF lady was doing impressive crunches, and maybe she wasn't. She could have gotten up on that punching bag and then slowly let her body go back until she was upside down, and then stopped, and got off. Then in the computer, you run the images backwards to make it look like she did a crunch, and then loop it to make it look like she did a lot.
She's in better shape than I am, so there are no criticisms here from me, even getting up on the punching bag and letting herself lean back slowly requires pretty good strength.
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