How can I not be awkward with my personal trainer?

Ok well he's more than a trainer he's my friend, and Ex friends with benefits. We had sex for three months. He is friends with all my friends though and once a week trains everyone. I keep not going because I'm nervous. I'm not even in that good of shape. But I'm worried about being awkward. How can I be cute and friendly?
How can I not be awkward with my personal trainer?
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