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Every time I've broken my collarbone I'd hit my shoulder into the ground with zero time for anything. Mostly my hands don't come off the bars until I'm stopped and standing up. If I crashed slow enough to think about circus tricks I wouldn't have broken any bones at all. As for "odd bruise" apparently I don't have any broken ribs but it still fucking hurts to breathe a few weeks later.
I meant what I said upthread about doing a parachute roll to avoid breaking your collarbone. It's a useful skill for anyone. (I last used it when I was run over by a car.) When we fall our natural reaction is to put our arms straight out and land on our hands. This results in a very sudden stop with a big shock to the collarbone. If you can overcome the instinct to put your hands out the impact is shared by your hip and shoulder and you roll. Nothing broken. Just the odd bruise.