How to made a part in inventor with contraction?

Hello. I need to make a pneumatic artificial muscle in inventor. It's finished, but the only thing I don't know how to do is the contraction of the muscle. I mean the muscle needs to pull a few string, with it's contraction. and I don't know how to make it to contract. I would appreciate any help, also I hope that my problem is understandable.

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You have to make the muscle adaptive.

This video is somewhat related to your problem, but this is a very basic one.
The muscle would take a bit more work.
But the basics should be the same.

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