ITwelve-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 pitching?
