In backpacking training, we were told that a very common injury when a hiker falls down a slope/off a rock is for both arms to be broken, especially the forearms, because everybody sticks their arms out in front of them to break their fall. Common defensive action. In my Aikido training, we would take a "head long" fall by extending one arm out to blend with the ground so that we could go into a shoulder roll. One day when I had finished emptying the back of a pick up into a trash bin, I jumped down to the ground. My pants leg got snagged on something and suddenly I was heading head-down onto the asphalt. Without panicking, without even having to think (which is probably why I didn't panic), I extended my arm, blended with the ground, and went into a shoulder roll that ended with me popping upright onto my feet. A dance friend who has done a lot of ballroom described a situation in which it was her dance training involving aerials that saved her from damage in a fall. So it doesn't matter exactly where we get the training from. It has been more than 40 years since my Aikido training, so I cannot credit it for my recent save for one main reason: my reaction was nothing like we had done in my Aikido training. Mainly, I credit "body sense", which we can learn from so many different sources, in which I could tell that my balance had been compromised and that I had to take action. Along those same lines, I find that I react much more quickly to near collisions with other people than should be normal (ie, non-dancer), avoiding such with footwork instead of being flat-footed. I think that is learned from practicing floorcraft. Of course, when I slip past somebody with a travelling turn, then I might be pushing it a bit.