This sequence shows the range of muscles, and the amount the shoulder rotates in order to perform a throwing action.
Preparing to throw
Muscles in the shoulder, back, and arm contract to raise the arm and pull it backwards.
Snapping forward
Just before throwing, the chest and upper arm muscles contract to lift the arm up and forward, rotating the shoulder joint.
Following through
As the ball is released, chest and side muscles contract to pull the arm down and around the body, rotating the shoulder further.
Picture Credit : Google
