Muscularity (noun)

1. The state or quality of being muscular.
2. The condition of being well-developed in muscles.

Origin:

The word muscularity came into english in the late 19th century, it is a combination of the word "muscle" and the suffix -ity, which denotes a state or quality.

Examples:

1. She admired his muscularity as he flexed his biceps.
2. His muscularity was the result of years of dedicated weightlifting.
3. The dancers' muscularity was obvious as they moved gracefully across the stage.
4. He was proud of his muscularity, but also made sure to maintain flexibility and endurance.
5. She was impressed by his muscularity, but also noted that he had a surprisingly gentle touch.