@ehBeth,
Their bodies are supposed to be solid and muscular, but shaped like a whippet...that is with a pronounced curve up to the back legs.
Their legs are supposed to get as long and slender as the Siamese, and to have that oriental look.
But they are more solid, and they eat like pigs...you have to watch that. I have only ever had one Siamese who ate too much...and he was a porker! They are intensely active...which I am seeing...thank god they have each other!
They have galloped off somewhere together while I type, but mainly they have been speeding around me, like the tigers who turned to butter (in one of the Epamimondas stories, I think?)