How to talk or flirt with a guy at gym?

Let me give you context, I'm attracted so hard to this guy at gym and I really want to talk to him, but I don't know how to start, actually I dont even know how to start a conversation with anyone tbh. This might be silly but please give me so advice. Thanks

by the way he is never alone, he is always with some other guys.
How to talk or flirt with a guy at gym?
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