Body is deep through girth mean' means the distance from the top of the back to the belly just behind the elbows has good depth (where the girth would go if the horse were saddled). A horse with good girth depth is thought to have more stamina as there is room for a larger heart and lungs.
'Sloping hindquarters' the slope from the peak of the croup to the tail head or the point of the buttock.
'Upright shoulders' an angel to the shoulder blade that is steeper than 45 degrees.
'Long sloping shoulders' The shoulder blade (from withers to point of shoulder is long and shallower than 45 degrees.
'Rounded hindquarters' As opposed to flat, under muscled or weak in musculature.
'Deep round body' a body type with adequate heart girth and good spring to the ribs.
There is something about the outside of a horse that is good for the inside of a man. ~Winston Churchill
) Dinosaur Horse Trainer