That is a pretty cool idea. I have never heard of one before this post. I also work on form quite often but I use a 21# @28" bow. A light weight bow like that lets you know about every mistake you are doing. Bow had position, finger tension, release, posture, anchor point, nothing goes undetected by using a light weight bow. Once you get the consistency and grouping down with one, your hunting weight bows are second nature. It also helps if you have a buddy helping by watching how you shoot. Plus the light weight bow can also be used to introduce someone to traditional archery.