Even though I was a professional software engineer at the time, I was also a part time fitness instructor for over a decade. I even taught at women’s only gyms. I was really careful about not approaching anyone in my class - for the most part, women do not want to be approached at the gym - especially a women’s only gym, they go there specifically not to be bothered.

On a slightly tangential note women only gyms are the only place where some observant Muslim women could work out in comfortable clothing.