Final answer:
The main difference between a mature and immature overhead thrower lies in trunk rotation. Trunk rotation allows for proper sequencing of movements and generates greater power and accuracy in the throw. An immature thrower may not have developed the ability to effectively rotate their trunk, resulting in less efficient and weaker throws compared to a mature thrower.
Step-by-step explanation:
The main difference between a mature and immature overhead thrower lies in trunk rotation. Trunk rotation is the twisting or turning of the upper body, which is crucial for generating power and transferring it from the lower body to the throwing arm.
While arm strength, leg strength, and hand-eye coordination play important roles in throwing, trunk rotation allows for proper sequencing of movements and generates greater power and accuracy in the throw. An immature thrower may not have developed the ability to effectively rotate their trunk, resulting in less efficient and weaker throws compared to a mature thrower.