What is this machine called and what is the correct way to use it?

I went to the gym late last night and decided to try out this machine.. I think I used it wrong because I am SO sore today, I feel like I’ve pulled something. There was no one else at the gym when I went so I couldn’t ask anyone for help. And I don’t even know what this machine is called? Does anyone know?
What is this machine called and what is the correct way to use it?
What is this machine called and what is the correct way to use it?
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