A lot of people talk about a very "active process", personally when I come to full draw, I "feel" the transfer of weight onto my back muscles as I move into line, I then maintain the feeling there during the expansion of the shot. IMO if you're properly in line, it's amost impossible NOT to use your back muscles.
In terms of the active movement (which I can never feel) the best way I've found to demonstrate it, is to bring your hand up as if to full draw, then drop the wrist so that your fingers are touching the collar bone, then move the elbow back behind you (and for me, slightly down) keeping your fingers on the same place - this is the best way I can feel the movement I'm looking for, but I can't do it with a 38# bow in my hands as it's much less active than that (or I'd be pulling about 1" to get throught the clicker
).
Does all that make sense?? Probably not
