Set of pull-ups?

Answer:

ARMS

Hint:

Think of what you might flex after doing several of these exercises at the gym.

Explanation:

Set of pull-ups?" plays on two meanings of "pull-ups." One is the exercise where you pull yourself up on a bar, which works your arms. The other is the diaper-like training pants called "pull-ups," which come in sets. The answer "ARMS" cleverly refers to the body part you use for the exercise, not the product.

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