He looks to have some measure of halter breeding. His hind legs are posty with sickle hocks. His peak of croup is set too far back and the croup itself is steep making the hindquarter, while well muscled, stiff. He is long through the coupling. His neck is set correctly on a steep shoulder. He is a bit pigeon breasted and his front leg is over straight and set back underneath him.
If the leg is not naturally set back like that then I bet he has back issue.. just ahead of the peak of croup.. causing pain. He may be trying to relieve the pain by standing under himself in front. Or he may simply stand that way.
There is something about the outside of a horse that is good for the inside of a man. ~Winston Churchill
) Dinosaur Horse Trainer