Śarīra

Body, sheath. The human being possesses three śarīras: sthūla (gross, physical), sūkṣma (subtle, energetic-mental) and kāraṇa (causal).

This threefold classification is fundamental in Vedānta and correlates with the three states of consciousness: waking, dreaming and deep sleep. Haṭha Yoga works directly on all three.