Can you go at a different time or to a different gym? She would probably wonder where you were. If possible, it would be good for you to switch it up. Seeing them everyday makes it so hard to get over them...I dealt with that with my POI.
I can't switch it won't fit my schedule I think she still heart broken from her divorce she always there even on the weekend 7 day a week the same time too. And she still there for 4 to 5 hours.
That's along time to be at the gym. She must have some issues... It's pretty obvious she is still hooked on her ex emotionally in some way and is heartbroken from it especially if she is at the gym that much. That doesn't seem healthy. I agree with everyone else, I would avoid the gym if at all possible, if not try and stay away from her when you're there. Don't even look at her and don't give her any hint that you are still interested. Pretend like she doesn't exist. Give her space and see if she comes to you and in the meantime go about your life in a neutral, indifferent way. It doesn't sound like she's looking for a relationship or love right now. I think the best thing that can come out of your situation would be to build friendship with her and just be someone in her life, she seems lonely.. but unfortunately i think that would be difficult for you since you obviously have a lot of feelings for her. Just my advice.. as a girl..lol