To understand Adhitthana in the context of meditation I suggest readers attend one or more 10 day Vipassana course conducted by sri S.N.Goenkaji. Sit with your spine erect, close your eyes,. Don't unlock your hands and feet for an hour or more. Bear with all discomfort with equanimity. All unpleasant sensations so borne with attenuates dosa, hatred. All pleasant sensations during meditation which is borne with equanimity attenuates raga craving, all gross sensations cures you of Moha, Ignorance. Go thr' and experience.