I used to do that kind of thing all the time with some of my friends for fun, though I've cut down as of late because my loved ones have worried I was going to get "hurt" or "killed."
In all honesty, the hardest part for me was learning to stay focused. If you get distracted, you can miss when something happens that's going to make you need to adapt, and if you don't adapt to the situation you may find yourself in need of cast. Always having been somebody that suffers from fairly severe ADD, I gained a lot of cuts and bruises that way.
Actually, learning to do this kind of thing is pretty good in the rest of your life too. It teaches you to think incredibly quickly and builds up your awareness of self really well. My friends and I can walk through a crowded room without touching a single person just because we're all really aware of where our body parts are at a given moment.
Not to mention the self-confidence boost we get from being in shape and knowing the kinds of crazy shit we can do that most people don't even think about.
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