Windup -From your starting stance, begins when the pitchers steps back with the non-throwing foot, balances on the other foot, and picks the non-throwing leg up. This phase ends when leg is at maximum height, and the hands begin to separate.
Shoulder Girdle- Dominant and non-dominant scapulas are in upward rotation.
Shoulder Joint
Extend shoulder joint ( by eccentrically contracting the latissimus dorsi, teres major, lower pectoralis, and posterior deltoid muscles.)
Elbow Joint
Concentrically contracting the biceps brachii, brachialis, and brachioradialis muscles.
Hip Joint
Non Throwing leg, your hip is flexed by concentrically contracting your iliacus, psoas major and minor, rectus femoris, sartorius, pectineus, and tensor fasciae latae muscles, causing an anterior pelvic tilt. The opposite of your hip externally rotates by eccentrically contracting your piriformis, gemellus superior and inferior, obturator internus and externus, and quadratus femoris muscles. This causes a left transverse rotation.
Knee Joint
Non throwing knee is flexed to 90˚ by concetrically contracting the biceps femoris, popliteus, semimembranosus and semitendinosus. The opposite knee externally rotates by isometrically contracting your biceps femoris muscle.
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