How would I write this in a summary:

10. Somatotonic Mesomorph. If a man is definitely a broad type rather than a thick or long type, he is likely to be rugged and have lots of muscle. He is apt to have big forearms and legs, and his chest and belly are well formed and firm, with the chest bigger than the belly. He would rather breathe than eat. He has a bony head, bit shoulders, and a square jaw. His skin is thick, coarse, and elastic, and tans easily, If he gets bald, it usually starts on the front of the head.

To summarize this, I suspect what you are being asked to do is restate it, in as few words as possible, in your own words. Many details are listed here. How would you make the same statement about this allegedly "broad" type of male without so many details?

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In summary, a somatotonic mesomorph refers to a man who has a broad and muscular body type. This individual typically has well-formed and firm chest and belly muscles, with a larger chest compared to the belly. They often have prominent forearms and legs, and a bony head with broad shoulders and a square jaw. Their skin is thick, coarse, and elastic, and they have a tendency to tan easily. If they experience baldness, it typically begins at the front of the head.