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Re indoor wallclimbing: I don't have any natural cliffs near me (I think the closest thing would be abandoned quarries at >2hrs driving) and I think that holds for many people.

> "that's dumb, we already have natural trees outdoors. Why do we need to put them indoors?"

Do you live some place where it does not snow in winter?

At least at my climbing gym they change the routes frequently, providing a lot of variety and covering a wider spectrum of grading than any single location anywhere nearby can. Not to mention it never rains or snows in the gym, you don't have to haul equipment to the site, and it's slightly safer.

I think recreating tall cliffs indoors is dumb. Why climb up high? Instead make a large cylinder that rotates slowly and mount it over a ball pit.