Which muscle do clients need proper extensibility of before performing the ball medicine ball (mb) pullover throw exercise, in order to decrease stress to the low back and shoulders?

It is important to ensure that a client has proper extensibility of the latissimus dorsi muscle before performing the ball medicine ball (MB) pullover throw exercise to decrease stress to the low back and shoulders. These muscles connects the upper extremity to the vertebral column. They are responsible for extension, adduction, transverse extension also known as horizontal abduction, flexion from an extended position, and internal rotation of the shoulder joint.