Explanation, mostly from green_knight of why this is an example of excellent dressage teaching.
Puissance (high jumps) for horses
The videos and more information (the record is for 7' 10", though that isn't shown-- 6' 10" is impressive enough) is from Diana Hsieh at Noodlefood. What amazes me most is that I'm pretty sure the horses would have to be trained to tuck their hooves in while they're jumping so as not to knock blocks off the walls, and I have no idea how you'd do that.
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