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Thanks, floridafan...
Answering the posed question...
Honestly, IMO, this far more sports science detail that is required (see above) but, OK...I'll take the bait...
The simple version...
The foot bone connected to the leg bone,
The leg bone connected to the knee bone,
The knee bone connected to the thigh bone,
The thigh bone connected to the back bone,
The back bone connected to the shoulder bone,
The shoulder bone connected to the arm bone
The arm bone connected to the wrist bone”
And If we really must...The sports science version...Parapharased from sports science journal and edited...
The parts of the body act as a system of chain links, whereby the energy or force generated by one link (or part of the body) can be transferred successively to the next link. The link system starts from torque with the ground. The optimum coordination (timing/rhythm) of body segments and their movements will allow for the efficient transfer of energy and power up through the body, moving from one body segment to the next. Each movement in the sequence builds upon the previous motion and they all contribute to the generation of Bat speed.
This transfer of energy in sequential coordination is also enhanced by the stretch-shortening cycle of muscle action. The stretch-shortening cycle involves the active stretching (the muscle is activated but is elongated by another force) of a muscle in a countermovement immediately followed by a more forceful shortening of the muscle in the desired direction. For example, the chest and shoulder muscles are actively stretched (coaches often use the cue “loading” here) as the trunk rotates (see below) into the swing and the inertia of the arm, wrist and and bat cause them to lag behind in sequence. When they catch up, the whip is cracked and the energy is released.
The active stretch of the muscle stores energy in the elastic elements of muscle and associated tissues such as tendons, which is reused as the muscle begins to shorten.
This sequence of muscular coordination tends to be chosen naturally by the brain, but sometimes this must be coached in players who develop pauses, that in turn lead to missed segment rotations or problems in sequencing segments. The most effective swings begin with leg drive generating ground reaction forces that can be transferred up the segments of the kinetic chain to the Bat. Proper sequential timing of the segments in the kinematic chain and stretch-shortening cycle muscle actions maximize the transfer of energy to generate the greatest bat speed.
Baseball Swings typically involve five major kinematic links that the player has to coordinate. In most cases the swing is based on a sequential summing of the motions of the legs, trunk, arm, forearm, and wrist/hands.
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If this is a velied attempt to make the case for it being a rotational action,
it is...sort of, but that is FAR too simplistic an explaination in kinetic/kinesthetic terms. It would be more kinetically correct (thought still far too simplistic) to say that kinetic chain is a series of small rotations connected sequentially/rhythmically, transferred late into some slight level of linear motion depending upon pitch location and desired directional intention.
Fire away...
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