Well-
As a general videoanalysis rule, the amount of movement is less important than the sequence of the movement. A lot of what you ook at has to do with generating and transferring momentum which is more related to when a given part gets to max turning speed. Max turning speed/momentun is not necessarily related to how much the part turns.
Muscle action is also very difficult to see and very variable and feel of muscle action is ever changing.
On the other hand, details of motion and sequencing are important.
I find the best way to make sense of tis is to work at the skeletal/joint action ("kinesiological") for analysis.
So "how much" the front foot opens is not important and will vary with individual style, including how off the plate you like to be.
On the other hand, ANY well sequenced overhand throw or swing should have the upper and lower body synched such that the back elbow and front leg externally rotate at the same time and in the same sequence, leading hip opening, not being pushed open by hips.
These joint action/results can be seen fairly well on video. Another good marker is bat tip motion which is an exaggerration of what hands are doing.
Dealing at the muscle level can be useful in person teaching feel and interpreting cues.
So how open or closed the foot is is not very important, the question is does it open by external rotation of the front leg and how does it synch with back arm.
As a general videoanalysis rule, the amount of movement is less important than the sequence of the movement. A lot of what you ook at has to do with generating and transferring momentum which is more related to when a given part gets to max turning speed. Max turning speed/momentun is not necessarily related to how much the part turns.
Muscle action is also very difficult to see and very variable and feel of muscle action is ever changing.
On the other hand, details of motion and sequencing are important.
I find the best way to make sense of tis is to work at the skeletal/joint action ("kinesiological") for analysis.
So "how much" the front foot opens is not important and will vary with individual style, including how off the plate you like to be.
On the other hand, ANY well sequenced overhand throw or swing should have the upper and lower body synched such that the back elbow and front leg externally rotate at the same time and in the same sequence, leading hip opening, not being pushed open by hips.
These joint action/results can be seen fairly well on video. Another good marker is bat tip motion which is an exaggerration of what hands are doing.
Dealing at the muscle level can be useful in person teaching feel and interpreting cues.
So how open or closed the foot is is not very important, the question is does it open by external rotation of the front leg and how does it synch with back arm.