Movement Phase

When ready to jump the player will push off of the balls of their feet with all of their weight.  This will generate the power needed to leave the ground with sufficient height for a successful shot. With the throwing arm the player will push from under the ball causing their elbow to fully extend.  The support arm will remain in position to help guide the ball in the proper direction.  

Shoulder Girdle:

Upward rotation and elevation

Serratus anterior, middle and lower traperzius levator scapulae, rhomboids

Shoulder Joint:

Maintain shoulder joint flexion by isometrically contracting shoulder flexors
(anterior deltoid, upper pectorallis major)

Elbow Joint:

Fulled extend the elbow of the throwing arm by eccentrically contracting the elbow extensors.

(triceps, anconeus) 

Maintain elbow flexion of the support arm by isometically contracting the elbow flexors.   

(Biceps Brachii, Brachiallis, Brachioradialis, Pronator Teres)

Hip Joint:

Flexion and anterior pelvic rotation will take place during this movement, providing the proper base of support before jumping.  Eccentric contraction of the gluteus maximus, semimembranosus, semitendinosus, and biceps femoris will take place during flexion.  The same muscles then concentrically contract throughout the jump.

Knee Joint: 
Knee flexion takes place before the jump, thus eccentrically contracting the quadriceps muscle.  
(Rectus Femoris, Vastus Medialis, Vastus Intermedius, and Vastus Lateralis)
During the jump, the quadriceps muscle will concentrically contract.
(Rectus Femoris, Vastus Medialis, Vastus Intermedius, and Vastus Lateralis)