Twelve-year-old Aaron tried out for the Little League baseball team and was chosen as a pitcher. One day, after a few months of practice and games, Aaron's father told him, "Hey, kid, you're really getting some muscle definition there! You're going to be a major league pitcher someday, with muscles like that!" Which of Aaron's muscles in particular do you think were growing stronger and getting larger as a result of his throwing?

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Answer:

These muscles are all around the shoulder joint, with the deltoids being two of the larger shoulder muscles and the supraspinatus and infraspinatus being part of the rotator cuff muscles that help you rotate your arm to finish the throw.

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