When describing a boy's muscles and abdominal muscles, you can express them in the following aspects: 1. Muscle Lines: The lines that describe muscles, such as smooth curves, strong physique, tight muscles, etc., make the reader feel strength and beauty. 2. Muscle texture: By describing the texture of the muscles, such as smooth, rough, firm, soft, etc., to express the shape and strength of the muscles. 3. Abdominals: Abdominals are one of the most important parts of a man's body. It can be expressed through clear and obvious abdominal lines, abdominal contraction and expansion. At the same time, abdominal muscles were also a symbol of male hormones, so describing abdominal muscles could reflect the character's confidence, strength, and charm. 4. Fair-skinned: A boy with fair skin is usually considered to be cleaner and neater, and also has a certain sense of beauty. He could describe his skin color, skin texture, hair, and other details to show his health and cleanliness. When describing a boy's muscles and abdominal muscles, one had to pay attention to moderate exaggeration and not overuse or distort it so that the reader could feel the true beauty and power.