According to Osho, prana is the vital life-energy—not breath or thought themselves, but the force that moves them in and out. In all seven bodies—physical, etheric, astral, mental, spiritual, cosmic, and nirvanic—it manifests as opposing currents of inflow and outflow: as breath in the physical, influences in the etheric, thoughts in the mental, and subtler corresponding exchanges in the higher bodies.
Prana is the power that makes everything in you swing in and out—air, ideas, and subtler feelings—at every level of your being.