Just to record, I'm still alive.
The sensation was very similar to the first time I went outside in female alone. The caardiometer kept all the time in 155 (normal for me is 90-100), and in the moment of taking eliptica, directly at 170+. Which is the safe limit I have set the cardiometer (and the machine starts ranting).
The experience itself was terrifying, but...
- When I entered I was alone, so I put everything as fast as possible. Somebody came and greeted me, but the locker's door was covering my face.
- Poop Happened when the tuck started to loosen in some exercises that were pressing the bollocks down. Then I went back to use the bathroom... Panic, since they were facing the showers. I did not even wash my hands for fear of another person already washing them
- At the end I was trapped in the middle of a group of women, and I am worried about if holding doors could have clocked me (for me it's general courtesy). A lot of people were changing, so I put on my jacket in front of the locker without looking anywhere else and scram.
So little to no human interaction today, save from shopping for a can of beans later.

And yesterday I spent a long time preparing. Not only razoring my legs, but yup. Doing my nails as carefully as I could