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In the Internet I have found one extreme sport mixing three of the four different categories you have given to us: air, water and mountains. And this extremes sport is rappel. You do rappel in the mountain, it can be close to a waterfall, and in spite of you can think it is not a air sport, sometimes it is, because it depends of the place, you can be held by a harness, with the space on your feet.
The rappel it consist in descend a wall or a vertical surface held by a harness, as I said, being helped by your feet. An appropriate equipment it is required (helmet, harness, good shoes, and comfortable clothes)
I have already done it, in Thailand, two years ago. And I really had fun!!!!!

You tried it Laura? You are very brave! Can I help you with some sentences?
and in spite of you can think it is not a air sport= And although you might not think it is an airsport
The rappel it consist in descend a wall= Rappel consists of descending a wall
Thanks!
Pieter