How do I get him to approach me?

How do I get him to approach me I've been running to the gym a few days a week a month or two after being in a bad relationship, and its helped me as a way to heal. I've been gaining some confidence in myself and feeling better between working out and eating right. I've gotten a little bit of a crush on one of the personal trainers but I'm nervous to talk to him. He seems a bit out of my league, even if I was ready to just jump back into dating immediately right now. I've caught him glancing up a time or two when I walk by his office and he's waved or said good morning a time or two. I'm just a very awkward person and wasn't sure what to carry on a conversation about. He's been pretty quiet lately and is normally busy training someone. I'm normally gone within a hour or two.

How do I get him to approach me?
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