[Marcus26]

Back tension s a bad term because you don't want back tension, you want scapula movement.
The term 'crushing a matchbow between the shoulder blades' is poor because that's not the direction you want the scapulas to move.
The front scapula should stay pretty still and low.
The rear scapula should slide in below the front scapula.
All movement and should be done using the lower traps to continue moving that scapula down and in towards the spine.
It should not be tense, it's a relaxed free movement.
The forewarms should be as relaxed as possible and on release drop to zero tension.
Note that letting go of the string does not do this, it creates tension, the fingers should relax, not open.

Compound is no different. One thing I do is make sure I can move all my fingers around my release aid and keep the back holding the weight not my arms. When I am shooting well their is no weight held anywhere but my lower traps.