After a few days try to increase the period of inhalation and exhalation, maintaining the same 1 to 1 ratio.In other words, try to increase the time of inhalation to 6 and the time of exhalation also to 6. When this is easily achieved try to obtain a count of 7 for inhalation and 7 for exhalation. Do not force the breath in anyway. Be careful not to speed up the counting during exhalation to compensate for shortage of breath. At the slightest sign of discomfort reduce the time of each inhalation and exhalation or discontinue the practice for a day.
Figure 40: Pranayama - Stage 2