Quarter Horses , thats exactly what they are , but with more chrome.
At some point in time in the pedigree they were Quarter Horses (for the most part)

Not like Apps that at one point were a very different type and now look like Quarter Horses with spots.

Just like American Shetlands at one time didnt resemble Hackneys ponies but now do.

etc.. etc.. etc..

"Blessed are the flexible for they shall not get bent out of shape"
"You can discipline and Discourage or you can Discipline and Encourage"
"Gentle in what you do , But firm in how you do it"