Final answer:
The sell pull back refers to the movement of the scapula and shoulder blades during certain exercises, engaging the upper back muscles to move the arms.
Step-by-step explanation:
The subject of this question is Health.
When discussing the sell pull back, it refers to the movement of the scapula and shoulder blades during certain exercises or actions. The upper back muscles are responsible for moving the arms, and when performing exercises like pull-ups or rows, it is important to focus on squeezing the shoulder blades together to engage the back and ensure proper form.
For example, when performing a pull-up, you would start with your arms extended, hanging from a bar. As you pull your body up, you would focus on squeezing your shoulder blades together, engaging the back muscles, and using them to lift your body.