We all agree that we live in an accelerated world, cities, the traffic, the financial and labor problems and the problems of every day, all they do that, our body tension build up, what we call stress. But that is it stress? Few understand what is the real danger that is behind this word. The vast majority are unaware that, stress is much more that the voltage that lies behind the discomfort that we feel in the back. When a person feels back taut, what is actually happening, while we think that could be a bad posture or even that we have caught cold, what actually happens is that our sympathetic vegetative nervous system, which reaches the entire body through the spine, it is on exciting. This makes our bodies begin to produce and pump an excess of adrenaline, which is a hormone that is produced in the glands adrenal, located just above the kidneys. When this happens, the adrenaline modifies the State of our body, the veins and arteries are compressed, which is called vaso-constriccion, which increases blood pressure, and that cause than, the quantity of blood, nutrients and oxygen that it comes to the organs and the brain, decreases, this is the same as saying that all the organs of our body are or remain as if they were holding breath- he imagines it. Arriving less nutrients to the brain, this worsens your performance, so it comes off certain areas from him by security, areas that are vital to our daily life, this produces that we padezcamos among other things, a low working efficiency, loss of memory, which let us make errors, which suffer forgetfulness, which may have fatal consequences at the wheel of a car, etc. Moreover, we can notice how tense the muscles of the back, our biological defenses decrease, leaving us more vulnerable to disease.