Final answer:
The pull-up primarily targets the back muscle group, engaging muscles like the biceps, shoulders, and forearms for a thorough upper body workout.
Explanation:
The pull-up primarily works the back muscle group. This exercise involves hanging from a bar and using the strength of the arms to lift the body, activating the muscles in the back.
Additionally, the pull-up engages other muscles like the biceps, shoulders, and forearms for a comprehensive upper body workout.
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