I don't think the "jump and land on your feet" thing works too well unless you're going pretty slow and kind of expecting it. (Unless you're really good at falling I guess? xD)
I've fallen off so many times in the past two years, I've lost count. (I'm like prone to falling off ? S:) From just falling forward and sliding off the side, to spooks, to being run away with because a horse is terrified of a water bottle, to being galloped away with with an OTTB. x_x
I usually just let go and hope for the best, lol, not to hit my head or get stepped on. (Not the best advice. S:) I usually try and land on my back, but I end up falling on my tailbone and that's not fun. -.- Better than my face though I guess? I always wear a helmet, but I always end up hurting my neck too. :/ My last fall I wasn't hurt at all though, so I suppose I'm getting better at falling ? xD
I've fallen on my shoulder and it was rainbow colors for a few weeks, haha. I think my most "interesting fall" was when an OTTB ran away with me and I stayed on him (fastest galloping anyone there'd ever seen) for like 50 times around the ring (I don't know how. xD) until I lost my stirrups and tumblesaulted off. I literally hit the ground and rolled. I guess that's the best way to do it though? haha.
I think the most important thing though is make sure your feet are out of the stirrups. Dragging is one of my worst fears. x_x And making sure you're not falling off the rail side is nice too. xD And wear a helmet of course. xP I'd also advise getting up as fast as possible in case the horse is still running/bucking/etc.
Stay safe and on the horse! :]]
● Horseback Riding : (noun) : \ˈhȯrs-ˌbak\·\ˈrī-diŋ\ : The art of keeping a horse between you, and the ground. ♥