Inverted postures improve lymph and venous circulation. They work the heart and boost the immune system. Increased blood supply to the endocrine glands at the throat is the reason why inversions are considered to be hormonal balancers. As holding a position with a whole new relationship to gravity demands a certain steadiness of body and mind, inversions are calming poses. Inversions let us see things from a new angle. They lessen tiredness and develop concentration. As inversions quiet the mind and settle the system down, they are generally practiced toward the end of an asana session, after your body has been well warmed up.
