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MTL - Kendo True Explanation - Chapter 22
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... an who is pulling the butterfly machine with chest muscles is the most eye-catching among them.
The butterfly machine is a device that keeps opening and closing the arms towards the middle, exerting force, and exercising the chest muscles. The opening and closing strength can be adjusted by hanging heavy objects on the back of the machine.
Most people exercise with four or five dollars stacked on the back. A slightly stronger person might be able to get a dozen weight plates. I ...
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