The spine is the central axis of our body. It is crossed over by numerous nervous bundles connecting vital organs to the brain and has very many functions, such as sustaining the bone joints, the muscles and the skull, providing the dynamic and static balancing of the body and fastening the rib cage, which is directly linked to the breathing process. A sedentary life, limited exercise and the gravitational attraction while we are standing often generate rigidity and tension in our back and create psychophysical imbalance and illness. Through experience and the practice of Asanas, Yoga helps us free our bodies from blocks, rigidity and tensions and allows us to find lost flexibility, elasticity and psychophysical well-being. The Asana postures presented in this handbook will help you, through constant practice, to gradually regain control of your body and to better understand the importance of your back.