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The overhead throw is an kinetic chain. in this video, the athlete is completing a rehab plan where he is going through the entire rang of throwing.

There are six phases of throwing in an overhead throw:
Wind-up- cocking of the arm

Stride- The lead leg drives forward while the throwing arm externally rotates

Arm Cocking- when the lead foot makes contact with the ground and the hip and pelvis. Muscles acting at the shoulder and scapula position the glenoid fossa against the head of the humerus and stabilize the scapula.

Arm Acceleration- quickest phase of the throw, The internal rotators of the shoulder have been stretched like a coiled spring during the previous phase. They shorten rapidly, assisted by this spring-like effect, and produce very rapid internal rotation of the shoulder.

Arm Deceleration- This phase starts when the ball is released and ends when maximum internal rotation of the shoulder is reached

Follow Through- This phase begins when when the internal rotation of the shoulder ends and finishes when the thrower returns to a balanced position.This part of the movement is designed to extend the time that it takes to come to a stop as well as distribute the forces to the body and leg