A sub-type of Nāma (body-making) Karma, the rise of which is responsible for the balanced weight of the body, making it neither too heavy nor too light.
yadudayāt prāṇināṃ śarīraṇi na guruṇi nāpi laghūni kintvagimdaghurūpāṇi bhavanti, tadagurulaghunāma.
(Prajñā 23.51 Vṛ Pa 476)
Agurulaghupariṇāmaniyāmakamagurulaghunāma.
(TaBhā 8.12)