The sensible practice of yoga does more than slap a Happy Face on your cerebrum. It can also massage the lymph system, says Dr. Mehmet Oz, a cardiac surgeon at New York Presbyterian Hospital in Manhattan. Lymph is the body's dirty dishwater; a network of lymphatic vessels and storage sacs crisscross over the entire body, in parallel with the blood supply, carrying a fluid composed of infection-fighting white blood cells and the waste products of cellular activity. Exercise in general activates the flow of lymph through the body, speeding up the filtering process; but yoga in particular promotes the draining of the lymph. Certain yoga poses stretch muscles that from animal studies are known to stimulate the lymph system. Researchers have documented the increased lymph flow when dogs' paws are stretched in a position similar to the yoga "downward-facing dog."
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