Pranayama Kosha is the second of the five sheaths, or layers, of the human being according to yogic philosophy. It represents the energy body, encompassing the life force known as prana, which flows through the nadis and is concentrated in the chakras. Pranamaya Kosha is responsible for vitality and sustains the physical body, linking the physical and mental planes. Practices like pranayama and energy work help to balance and strengthen this sheath, promoting overall well-being and health.