the 2 anky photos linked above do not show a behind the vertical horse. the first one is quite a lot in front of the vertical, the second one less so, but still in front.
i would say the piaffe on the pictures above of the lady is very incorrect. the balance of the horse is incorrect, the position of the legs and the rider position and aids is incorrect, the horse is falling forward on to the forehand, so that is why the extreme sit behind and the hind legs coming into such an extreme sit. this is a bad way to piaffe as it strains too much the horse and no transitions can be done correctly, nor can the piaffe be sustained, he will fall out of it.
for further discussion of why that piaffe is incorrect, look at decarpentry’s book on piaffe and passage, called prosaically enough, ‘‘Piaffe and Passage’’.
as someone once said just because foreleg is up and there is sit doesn’t mean it is correct piaffe. there has to be balance and correctness, and it gives lie to the saying, ‘‘too much is never enough’’.
too much sit IS too much sit, it is an evasion and a problem.
if you think it is a good piaffe in the pictures, i wish you all the best and hope you have a wonderful dressage journey. i just happen to feel it is not a picture of a good piaffe. in fact extremely bad. this is not to condemn rider or trainer or horse, it is just one moment and perhaps other moments were better, but the image shown is not correct.
[This message was edited by slc on Dec. 03, 2001 at 02:24 PM.]