If you fall "properly" off a bike, it should be you elbows, shoulder, knees and knuckles that take the impact, but also your palms will get a fair bit of impact. If you fall "like a twat" it will be your hands, wrists and shoulders which will be fecked. Big time.
Observe the rule: tuck and roll...dinnae try to save yerself by sticking hands out! Accept that your elbows and knuckles will get ripped to bits...and possibly your side. But there will be no breaks. Unless you hit something...or you shatter your elbow.
Yes, if you do Curling and other things on ice, then you learn VERY quickly how to fall properly.
Instead of thinking
'OH MYGODOHMYGOD I'm about to fall, WAAAAAAHHHHH!!'
Just accept it. If you recover and don't fall, fine, but if you are going to fall, you are going to fall and there is nothing you can do about it.
Once you have accepted this, keep thinking and overide your
'OH MY GOD!'
reaction and actually look where you are going to fall. Your vision might be blurred from the motion, but if you stay calm, then it is amazing what you can still see or at least make a guess at.
On going down, try and turn to the side whilst TUCKING YOUR HEAD IN so you don't bang the back of your head,
I cannot stress that last part enough (although it might be difficult with a helmet) and land accordingly to where you will have the softest (relatively) landing.
I know Curling and cycling are poles apart, but I have managed to control a few slips and avoid hitting the stones in play, some still moving, landing in a funny body position instead, and all done in a split second.
In short, overide your brain, keep thinking, turn to the side and tuck your head in so you don't bang the back of your head, LOOK where you are going and calculate how best to land!!
If you are quick with it then you will still have time to move your body and limbs accordingly, in a maneuver any gymnast or stunt man would be proud of.
It could be argued that it soon becomes an instinct reaction, and yes, that is true up to a point in the sense that you won't be able to control absolutely everything, but at the same time, you can still move yourself up to a certain degree.
And finally, if you still fall badly, then at least you will have done all you can to minimise the damage.