You learn to fall by falling! All sorts of so called training can be given. This mechanical horse was built to teach jockeys how to fall, it works to some extent as with a rotational fall but only that and fortunately they do not happen very often. Majority of falls are out to the side which doesn't involve head tucking.
I have never been what one could class as 'athletic' couldn't see the point in running or jumping unless I was on a horse! I was, however supple. Playing a lot of gymkhana games taught how to land whilst the horse was moving fast, riding naughty ponies taught me not only how but when to fall.
I would think that when they are in full uniform they are very handicapped as to being able to get into a good position to hit the ground. Of course I would think the thing that keeps them on top more than any other is the boots. None would be able to walk after a loose horse with those boots on! Notice after the inspection they removed their boots or were crippled if they tried to walk in them?
Captain Evil always singular three couple. Quornand would work providing, of course, one of the parents' name started with Q
(I have never known a Foxhound with a Q name - or E I J K O Q U X or Z)