Great input guys.
The type 3 swing isn't technically a looped motion so vertical momentum of the racquet exiting the backswing isn't really desired. The vertical position of the racquet head (in addition to external rotation) is a function of the flip so a downward motion artifact from the backswing or non-flip manipulation in the forward swing is actually an interference.
Some momentum of the hand may be marginally useful to help generate the forward force in the early forward swing by facilitating a feeling of fluidity. This is why some straight armers finish straightening the arm early in the forward swing. But this small amount of residual straightening is driven by the torso rotation and early non-twisting shoulder (motion dependent) rather than the elbow being actively extended. Building this into players creates a lot more problems than it solves - it must evolve as an optimization.
The problem with the elbow is two-fold: positioning and bending in the early forward swing. The key point to me goes back to the "hips create flips" idea. Proper sequencing implies the shoulder joint can be quite inactive (relaxed) in the first part of the forward swing. This is necessary for proper flip mechanics but is a skill not inherent to most learning the swing. Rather they try to "muscle" the early forward swing with the shoulder - this causes both the positioning and bending problem which are quite related and unfortunately familiar if they come from a type 1 or 2 background.
I think it is the desire to crush the ball (for my players) that causes this muscling. If they hit from the service line (mini-tennis) they all look like Fed. Move them back to the baseline and everything changes. It takes time and experience (if ever) to convince them they can crush it more if they sequence rather than muscle the early forward swing.
The type 3 swing isn't technically a looped motion so vertical momentum of the racquet exiting the backswing isn't really desired. The vertical position of the racquet head (in addition to external rotation) is a function of the flip so a downward motion artifact from the backswing or non-flip manipulation in the forward swing is actually an interference.
Some momentum of the hand may be marginally useful to help generate the forward force in the early forward swing by facilitating a feeling of fluidity. This is why some straight armers finish straightening the arm early in the forward swing. But this small amount of residual straightening is driven by the torso rotation and early non-twisting shoulder (motion dependent) rather than the elbow being actively extended. Building this into players creates a lot more problems than it solves - it must evolve as an optimization.
The problem with the elbow is two-fold: positioning and bending in the early forward swing. The key point to me goes back to the "hips create flips" idea. Proper sequencing implies the shoulder joint can be quite inactive (relaxed) in the first part of the forward swing. This is necessary for proper flip mechanics but is a skill not inherent to most learning the swing. Rather they try to "muscle" the early forward swing with the shoulder - this causes both the positioning and bending problem which are quite related and unfortunately familiar if they come from a type 1 or 2 background.
I think it is the desire to crush the ball (for my players) that causes this muscling. If they hit from the service line (mini-tennis) they all look like Fed. Move them back to the baseline and everything changes. It takes time and experience (if ever) to convince them they can crush it more if they sequence rather than muscle the early forward swing.
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