This is an Asana for relaxation of all muscles, nerves, etc. This Asana should be performed at the very end. It is a closing pose. Mritasana is another name for this pose.
Spread a soft blanket. Lie flat on your back. Keep the hands on the ground by the sides. Stretch the legs quite straight. Keep the heels close. Let the toes remain separated. Close the eyes. Breathe slowly. Relax all muscles, nerves, organs, etc. Start the relaxation process from the toes. Then proceed to the calf-muscles, muscles of the back, chest, arm, forearm and hands, neck, face, etc. See that the abdominal organs, heart, chest, brain are also relaxed. Relax the plexus of nerves also. Now repeat "Om, Om, Om." Think of Atman. Think of Rama. Meditate gently with Suddha Bhava, feeling of purity. Do not sleep. Continue the meditation for 15 minutes. You will enjoy perfect peace, ease, comfort and relaxation. Every one of you should enjoy it. Words are imperfect. They cannot adequately describe the feelings.
Savasana combines pose and meditation. It gives rest not only for the body but also for the mind and soul. It gives relief, comfort and ease. Relaxation is a very important factor in muscular exercises. In Halasana, Sarvagasana, Paschimottanasana, Dhanurasana and Ardha-Matsyendrasana, you know pretty well that all the muscles of the back, Lettissimus dorsi, Psoasmagnus, Quadratus lumborum, Rectus, abdominis, Pectoralis major of the chest, Biceps, Triceps, the deltoid of the arm, Sartorius of the thighs, are all stretched and contracted to an enormous degree. During intense muscular activity, the metabolism is increased. Metabolism is the Anabolic and Catabolic changes that take place in the body (wear and tear in the system). Anabolic changes are constructive and Catabolic changes are the destructive ones. During metabolism all the muscular tissues are supplied with fresh oxygenated blood or plasma through capillary oozing and carbon dioxide is taken back through the veins to the right auricle of the heart. This is termed tissue-respiration. Just as interchange of oxygen and carbo dioxide takes place in the lungs, so also interchange of carbon dioxide and oxygen takes place in the tissues also. Mark the wonderful creation and working of the internal mechanism of the body! How marvellous is the machinery! Can a scientist make a single atom, a single cell, a single organ of the body? Bow with folded hands before the Creator of this wonderful mechanism of the body. Repeat Om Ram. Enter into silence. Meditate. The whole mystery of creation will be revealed unto you through His Grace.
The muscles that are put under severe strain demand relaxation and rest. It is Savasana that promptly and efficiently ensures complete relaxation and perfect ease.