Girls, A woman invited me to join her at the gym, is this a good sign?

Anonymous

A member of my gym asked me to join her group recently, and says hi when I pass. My rule is to never initiate social interactions at the gym out of respect, so I find it great to be introduced and invited to join her out of the blue. I have a great impression of her; courageous, funny and down to earth; so I'd like to get to know her. I'm single, but even making a new friend would be a great start.

What do you think the meaning is behind this, and is it good?

Girls, A woman invited me to join her at the gym, is this a good sign?
Updates
3 mo
Shortly after she greeted me, it turned out that classes she attends are a paid add-on that I was not warned or aware of; so it was slightly embarrassing to immediately leave. Afterwards, I saw her in the eatery I usually go to opposite the gym; but she only spoke to her circle, so I sat away. I guess I misinterpreted?

Another woman struck up a conversation with me after I joined an accessible class, and exchanged names. It's common to get interest; but they have to speak to me to start a convo
Girls, A woman invited me to join her at the gym, is this a good sign?
3 Opinion