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Hello! I've reviewed the user instruction for the Chest Expander model 43171781. This document outlines how to adjust the resistance using elastic bands with a clip mechanism and it has several modes of usage. I'm ready to answer your questions about this product, including how to change the bands and what the safety precautions are.
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What should I do before using the chest expander?
How can I reduce the elastic band?
How can I increase the elastic band?