Kisik Lee for those of you that may not know of him is the National Head Coach of the US Olympic Archery Training Program. He is thought of highly not only in the US but around the world.
He has an excellent handbook on training aids and specific exercises to help you as an archer. This is work with stretch bands, straps and the Formaster. You can find his Specific Physical Training Handbook by clicking here.
I found it to be excellent.
You can find out much more, including the KSL shot cycle on his website.