@devils Here are the exercises that I was speaking of; these are not kneeling but they are in a static position of the support leg which if you watch slow motion video of pitchers and quarterbacks you will notice; this helps develop “special” strength for either of the two so I use these as “bridge” from general to special preparation.
Those shown in the video are special preparatory exercises.
If you use a football (or baseball) and do the same arm motion but in a static leg position then they are special developmental exercises.
Quick note: My leg kinematics aren’t very good the knee should be more extended (or upright) and my trail leg shouldn’t be as extended. This will change with each individuals technique.