Like your interest in topics!View attachment 29265
There’s two things happening with rotation. One is using rotation to help with spin, the other is creating an offset between the between the plant foot direction (stride isn’t on the power line) and joint alignments. It’s physics.
Like your interest in topics!
( my comment is regarding analyzing mechanics)
When looking at analyzing pitching like to see examples of the same pitcher throwing multiple pitches, and if they have them different pitches (drop,rise,curve,change)
to compare their own individual rotation and where they are planting their foot on these different pitches. This way we are looking at the same body and the particulars they may adjust for the different pitches they are throwing.
Same with analyzing hitting. Like to look at same hitter on more than one swing and more than one pitch location.
Same when analyzing catchers receiving pitches and throwing. Ball needs to be in different locations, including wild and in the dirt.