You Can't Be in Public With the Fuck, Man.

Make it clear that she's not hitting on her, but make it obvious that she can escape the conversation as quickly as she wants. Ask her about things like, does your boyfriend work out the same place? Whatever. And let her engage you more if she wants to. If she doesn't, it's just like, yeah, and then turns back to her weights. Leave her alone. I cannot emphasize that enough. Make it very simple and easy and obvious that you're not trying. You're not trying to intrude on her workout. Very simple things at the beginning. Keep the handcuffs loose.