According to my experience in the gym (Uncle, what are you laughing at? I also worked out in the gym, although it was a long time ago. In fact, it is easy to strike up a conversation between men and women in the gym.
Let me give you a suggestion. You don't need to take the initiative to talk to each other, just quietly approach each other. For example, if he uses one instrument, you will naturally use another instrument near him. Of course, even if bench press will reduce your image, you don't want the other person to see you grin.