Close your eyes, inhale slowly, deeply . . . hold that for a heartbeat then exhale. Steadily. Repeat this three times—eyes closed with breaths full and controlled. A conscious breath can both calm and invigorate. It is essential for daily rest and action.    Oxygen In the material world, breathing requires physiological cohesion and internalizing that which is external to the body: oxygen. Among its many functions, breathing allows the body to oxidize available