Fitness of mental body (Buddhism)

This refers to the proficiency of the three aggregates of feeling, perception and formation or mental activities. The characteristic is healthiness of the mental body and freedom from illness, the function is to crush its unhealthiness. It is manifest as absence of disability and freedom from evil. Mental factors are the proximate cause. It is the opponent of corruptions like faithlessness or diffidence causing illness or unhealthiness in the mental body. Fitness of mental body and fitness of consciousness are considered together.

One of the formations aggregate (mental coefficients) of Hinayana Buddhism, being listed among the constant states which appear in their true nature, and as profitable primary (always present in any profitable or profitable-resultant consciousness).