Okay, I do not agree but I understand what you are saying. Now let's return to this clip. Does Federer qualify as "maximum leverage with both legs grounded" in this clip?
This clip was created to show front side usage..
So you disagree that these 3 clips aren't maximum leveraged against stretching obliques (core) ?
Is it possible there are multiple movement patterns ? Or do you think they are all doing the same thing but different styles ?