When the exciting scene is completed, your natural reaction will be to take a very deep breath and exhale. Because of your complete concentration, the breath is automatically held in the pause with the breath out. Therefore it is important in the strengthening of concentration to consciously develop the pause with the breath out. This process of breath control is called pranayama in yoga. Prana in Sanskrit language means vitality.
Vitality is that quality of a thing that makes it alive, a living being.
Yama in Sanskrit means control. The control of the vitality of the body is pranayama. The practice of pranayama in yoga means the control of the breath. Breath is the link with the prana, therefore the control of breath leads to the control of prana. Increasing psychic strength without proper psychic direction is dangerous.