koṣṭha: krūro mṛdurmadhyo madhya: syāttai: samairapi |

In Sanskrit Koshtha betekent grens. As well as a castle has its walls, a body has its border. In this verse regarding to a human body, the visible peripheral parts are mentioned as borders that surround many organs, tissues and energies of different kinds. Koshtha (a border) looks depending on how doshas in a body are present. When Vatta dominates within a body, the body (Koshtha) is hard on a surface, is dried out, dry, etc. (Krura). When Pitta dominates within Koshtha, then Kosththa is soft (mrudu), flexible, smooth, shiny. If Kapha dominates in a body, then the body is tense, fat, swollen, bloated, bulky, overfull (madhyam). If doshas are balanced in a body (sam), ie. no dosha predominates, the Koshtha is neither dry nor shiny nor bold...