Movement - core: Pectoralis Major.

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Prepare for the AFAA Group Fitness Instructor Test. Use flashcards and multiple choice questions, complete with hints and explanations. Get ready to ace your exam!

Multiple Choice

Movement - core: Pectoralis Major.

Explanation:
The movement being tested involves pushing the arm forward and across the chest, where the pectoralis major serves as the primary mover. This chest muscle is responsible for horizontal adduction and shoulder flexion, driving actions like chest presses and push-ups. Latissimus dorsi mainly handles pulling and arm extension, gluteus maximus isn’t involved in this upper-body movement, and the deltoids assist with shoulder movement but aren’t the main force in pushing the chest together. So the pectoralis major is the best fit for this movement.

The movement being tested involves pushing the arm forward and across the chest, where the pectoralis major serves as the primary mover. This chest muscle is responsible for horizontal adduction and shoulder flexion, driving actions like chest presses and push-ups. Latissimus dorsi mainly handles pulling and arm extension, gluteus maximus isn’t involved in this upper-body movement, and the deltoids assist with shoulder movement but aren’t the main force in pushing the chest together. So the pectoralis major is the best fit for this movement.

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