Our physical body is meant to move and exercise. If our lifestyle does not provide natural motion of muscles and joints, then disease and great discomfort will ensue with time. Proper exercise should be pleasant to the practitioner while beneficial to the body, mind and spiritual life.
Yoga teaches us how to use the lungs to their maximum capacity and how to control the breath. Proper breathing should be deep, slow and rhythmical. This increases vitality and mental clarity. Most people use only a fraction of their lung capacity for breathing. They breathe shallowly, barely expanding the ribcage. Their shoulders are hunched, they experience pain and muscular spasm in the neck and the upper part of back, and they suffer from lack of oxygen. They should learn the full Yogic breathing.
Long before the invention of cars, planes, telephones, computers, freeways and other modern triggers of stress, the Rishis (sages or seers) and Yogis of yore devised very powerful techniques of deep relaxation. As a matter of fact, many modern stress-management and relaxation methods borrow heavily from this tradition. By relaxing deeply all the muscles the Yogi can thoroughly rejuvenate his nervous system and attain a deep sense of inner peace.
Besides being responsible for building our physical body, the foods we eat profoundly affect our mind. For maximum body-mind efficiency and complete spiritual awareness, Yoga advocates a lacto-vegetarian diet. This is an integral part of the Yogic lifestyle.
Here is the most important point of all, we become what we think. Thus we should exert to entertain positive and creative thoughts as these will contribute to vibrant health and a peaceful, joyful mind. A positive outlook on life can be developed by learning and practicing the teachings of the philosophy of Vedanta. The mind will be brought under perfect control by regular practice of meditation.