Head to Knee and Stretching: This posture is the final compression pose which regulates the heart rate and metabolism. Improves the flexibility of sciatic nerves, ankles, knees, hip joints, shoulders, elbows, wrists, and last 5 vertebrae of the spine. Excellent for the immune and lymphatic systems. Improves circulation to the liver, spleen, kidneys, pancreas, thyroid, thymus, and intestines. Good for allergies and arthritis.