How do I break the ice with my crush?

I have a crush on this guy at the Gym and I'm kind of sure he has a crush on me too. We always work out next to each other and when I'm not around or next to him he will come and workout next to me. The crazy thing is we have never spoken to each other, but will literally move to wherever the other one is.
How do I break the ice with my crush?
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