I've went climbing a few times. I really like it and wish I did it more. I like the combination of physical and mental challenge. My cousin is really into it and has been doing it often for the past ten years or so.
I went on a date with someone who was into bouldering, unfortunately I wasn't into the person so we never got to the point where we could go together.
I'm sure there are lots of great places in Paris. You can probably find a climbing gym which would enable you to climb as much as you want and get in better shape in other ways as well. Maybe find one that's convenient to you and where you vibe with the people and find some people who you can look forward to seeing every time you go. Shame there are likely none that are okay with nudity lol.
If I'm ever in Paris, I'll let you know lol. That sounds fun.
Unfortunately, I don't have any YT or instas to recommend for climbing, but I wish you the best of luck as you explore your new passion.
Best of luck with all this!