In my view, the control segment of the swing by the hands and arms is the first one quarter to one third of the swing. This is what I refer to as swing initiation.
If the bat head extends into the zone in the first quarter of the swing, bat speed has been adjudged to be about 50 mph. Combining the hip turn nearly doubles the bat speed in its flight to contact.
Initiating the swing allowing the bat head to enter the zone in the first quarter of the swing will then end the control phase of the arms in the swing. This would be followed by hip turn increasing bat speed to allow the bat head to act as a projectile into contact.
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