Do I and how do I ask a guy out?

I like this guy I train with, he is two years years older than me, and I sometimes catch him glancing at me, and he's super nice to me. Even though I want to go out with him, I don't know if I should ask him out, and if I make a mess out of things, I don't know if I'll ever be able to go back to training. And if I do opt for asking him out, how do I do it?

What do you think I should do?

Do I and how do I ask a guy out?
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