This may not be everyone's cup of tea, but here is a description I just did for a PM. See if this gives you an idea about Bone alignment. Also, you can see some of what I talk about on the "rubber band" video I did on You Tube, TheMoebow1.
"Try this. Stand up and set your feet about shoulder width apart and then close your eyes. Now mentally explore your legs and how they are working. Is your upper body weight supported on muscle or bone? What are your muscles in your legs doing? Just holding the leg bones in alignment -- right? This is bone on bone alignment.
Now let's take this to an archery shot. Here is a description of bone on bone. Starting at your bow wrist, your bow arm is straight (upper and lower arm), the arm is set directly into the bow side scapula. From there, your two scapula are connected to each other by the collar bones. Finally, your string side arm is in a strong triangular position at full draw. This is a LOT more bones than the leg example but the idea is the same.
Draw a mental line from the bow wrist up the bow arm and across both shoulders. This should be essentially a straight line AND will cross the arrow line NOT parallel it. If you can learn this; when you draw and get to anchor, you will feel the bones take up a significant amount of the weight of the bow. It will (does) feel almost like the let off on a compound bow.
This gives us the opportunity to truly relax muscles and execute a good consistent shot. This too takes work ( what doesn't) and one really BIG reason coaches want archers to LEARN on a light bow. Once this is learned, moving up in bow weight is MUCH easier. You may even be able to shoot, with control, a heavier bow than you ever imagined -- if you want to.
I show a lot of this alignment and how to get it in the "rubber band" video I did."
Arne