Here is my 2c in regards to the physiology and biomechanics of drawing a bow.
In a draw you using 2 joints, the elbow joint and the shoulder girdle. Elbow is of lesser importance as the leverage (lower arm bones) should be online with the arrow hence leverage is minimized.
In the shoulder girlde we do a horizontal abduction of the shoulder joint (prime mover rear deltoid, Latissimus Dorsi and Teres Major/minor. Think rear shoulder and side of back cluster. Alas we also move our shoulder blade which recruits More of the Latisimus as well as Rhomboids and Mid traps.
Rhomboids also depress the shoulder blade hence keeping low shoulder is preferred.
On top of this we also need our rotator cuff muscles to be involved to stabilize the shoulder joint so the other muscles can do their job.
In exercise we will use lighter weight, lactile stimulation, visual reinforcements (video) to teach the body the right movement. Repetition, repetition and repetition of quality, controlled movement. Does this all apply to archery? No idea but it works in theory