https://www.youtube.com/watch?v=6hR2w9HASYQ

This is a very visual and useful video!! I completely agree with the conclusions of Murphy and Goober. I have been using a similar principle for a long time and call this the beginning of the "start-up point". By controlling the starting point from which the throw begins, you can control the hits well. But it works when you've already worked out the basic principles of throwing. the movement and motor skills of the whole body and the automatic identical release of the tail of the sling due to the relaxation of the hand.



https://rutube.ru/video/75cc96f2f02fab62cb22a6d72ddb5a6d/

Knife throwers call this point the beginning of the movement of the "KRTZ". the starting point of stretching the tendons and accelerating the projectile. As in archery, the point of maximum stretching of the bowstring and release.. This is the point at which the tendons in the body and arms of the thrower are stretched as much as possible. The throw occurs not so much by muscles as by the contraction of tendons. With the asterisks in the video, I tried to show the beginning of the "KRTZ".-the point of removal of the projectile.