Asana; a series of exercises, physical and mental, is to be gone through every day, until certain higher states are reached.
Pranayama is an exact science, controlling the vital forces of the body. It is the fourth Anga or limb of Ashtang Yoga.
Meditation is a state where mind has been trained to remain fixed on a certain internal or external location.
Surya Namaskar is a wonderful and effective practice to massage all the joints, muscles and internal organs of the entire body.