Step 2:

Push the ball away from your body in a linear motion parallel to the ground

Shoulder Girdle - Your left and right shoulders are both in abduction supernating with forward rotation about 90-100 degrees horizontally from the ground.  Your pectoralis Major is also contracting concentrically.

Elbow - Elbows are in flexion as the Biceps Brachii are contracting eccentrically and the Triceps Brachii concentrically contracting but slowly going to begin contracting eccentrically..

Wrist - Both wrists, hands, fingers and thumbs are in flexion with the Flexor Digitorum superficialis with the flexor pollicis longus contracting concentrically.  Both wrists are in flexion eccentrically contracting their flexor carpi radialis