Board Thread:Questions and Answers/@comment-3406131-20161105171445/@comment-16461120-20161105212720

The source of physiology section comes from Karnak's Official Handbook of the Marvel Universe entry.

It applies to all Inhumans because, although he's not in any way empowered by Terrigenesis, he is still stated to be physically superior to the most perfect human specimen, simply due to "eugenically superior Inhuman heritage".