Yoga Breathing - The four phases of wellness

The Sanskrit word sukha indicates something related to the pleasure the joy or happiness. The correct translation of Sukha Pranayama may be: control (ayam) the vital breath (prana) in a pleasant or easy (sukha), while the terms currently used breathing pleasant or easy. 
Yoga breathing exercises should be performed gently and without undue effort. To practice pranayama during yoga sessions, in general, choosing a meditation position as the lotus (Padma Asana) or posture perfect yogi (siddha asanas) in case of difficulty, however, rather than not to practice, you can sit normally, even on a chair. 
Important though is to have the spine, neck and head well aligned vertically and once obtained the best possible position is good freeze until the end of practice. 
A complete respiratory act consists of three phases: inspiration (puraka), retention (kumbhaka) and expiration (recaka). 

The-sukha pranayama includes four specific phases of the same duration (eg nine breaths for each type) each able to develop a quality: 
the first stage we tend to only develop the 'inspiration el' expiration balancing each other and this is the stage commonly called sukha that develops balance and harmony. 

In the second phase loma, it inspires you to retain full lungs and exhaling. The Sanskrit word can mean positive loma, assimilating, and convex heating. This phase, because of the lungs filled with fluid, tends to store energy. 

The third phase viloma provides the following conduct: inhale, exhale and hold to the lungs empty. Viloma stands for negative, oxidative, concave and refreshing. Indeed, this breathing is calming. 

In 'final stage catur (catur is number four in Sanskrit) is developed breathing square where all four phases converge: inhale, hold back on full lungs, exhale, hold back on empty lungs. Here we develop the 'self-control. 

Each of these four steps, if necessary can be used separately to develop their quality. In this case the number of breaths to be made could be decided following the 'goal. Better, however, to avoid unpleasant imbalances, take advice from an experienced master. 
It is also advisable, after the practice; relax for a few minutes on the floor in total state’s neglect, promoting the resumption of spontaneous breathing and natural.