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I think you mean "free solo climbing," not "free climbing." Free climbing means climbing with a rope and belayer but without artificial aid, like etriers or jumars.

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Free climbing is dangerous enough to be in that list, IMO. Lots of things can go wrong even with ropes.

You should check out Ryan Jenks on How Not To. His rope swings are pretty safe but also just insane at the same time.

How Not To is so good. Tons of scientific research and analysis goes in to his work.

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