I think when we talk about pulling through the shot, many people wind up using their deltoid muscles and never get into their back muscles. That's why they don't understand back tension. They simply never get the back muscles involved and never get the feel.

They seem to get a better feeling for back tension by trying to push the elbow straight back from anchor.

Some get the idea better by trying to visualize squeezing an orange between their shoulder blades.

Some have to try both at the same time.

So pick up that imaginary bow and get to work.