I have written about this before, but it is worth emphasizing.
As just one example, consider the finger release. When a shot is loosed, the string fingers open from their curled positions (around the string) and the string, freed, pushes the arrow toward the target. So, does the archer need to do something, like “open” the finger curl to allow the string to leave or is this something that just happens? I hope you know by now that the fingers play almost no active role in the release of the bowstring. They are flicked out of the way by the string itself. That happens because the muscles controlling the finger curl around the string, in the upper forearm, are relaxed and the fingers no longer restrain the string. The string rushes back to brace, flicking the fingers out of the way in its path.
This is not the only thing that “just happens” in an archery shot (most of the followthrough, the left-right and front-back weight distributions in the stance, the pressure distribution of the string/release aid on the separate fingers, the bowhand being shaped by the riser’s grip section, etc.). But to catalog all of those is not the goal of this post, rather I want to emphasize why it is important that you distinguish between these things.
The problem is if you mistake something that just happens for something to do, you are trying to solve a problem that doesn’t exist. Working on opening one’s fingers in a finger release is a fool’s errand. It is not what we want to happen and frustration is about the only thing that results (well and still fingers, sloppy looses, etc.).
The 60:40 front-to-rear weight distribution in an archer’s stance happens automatically. Trying to refine that would involve a lot of work and hardly will be worth the effort.
There is a concept in economics that applies here and that is “opportunity cost.” Basically, if you are doing A, you can’t be doing B simultaneously. So, if A is an unproductive effort and B is productive, then doing A instead of B costs you. You expend effort, money, time and you do not get better.
So, I urge you to take the time to identify what things in an archery shot, in your styles of expertise, are things that just happen. You need to avoid having your archers “work” on those. What they need to do is work upon the things that control those things “just happening.”
For example, if the pressures of the string are out of whack in a finger release, do you work with the archer to try to get them to change those? No, you do not. You look at the things that control those pressures: relaxed vs. tense fingers, angle of draw arm with string, etc.
Many people think that the fingers in a string grip need to be tense. To the contrary, they need to be relaxed. The muscles holding them in a curl attitude are in the forearm, attached to ligaments attached to those fingers. The finger muscles themselves need to be relaxed. Relaxed fingers are easy to flip out of the way and thus distort the path of the bowstring the least.
Among the things affecting the pressures of the string on the string is draw arm angle. A “high” draw elbow means the angle of the string hand to the string lightens to strength of the index finger and increases the strength of the middle and ring fingers. A low elbow does the reverse, so a low elbow leads to high fliers, etc. Ideally, the draw forearm is in a line, called the “Primary Force Line” with the center of pressure of the bowhand on the bow’s grip. Large deviations from that alignment create problems.