Sure, Mr. Chandra, There is difference of maintaining of purak (inhalation), rechak(Exhalation) and kumbhak (retention of breath). In ratio-based breathing, one can start with first 1:2 (purak:rechak) for one or two weeks and then continue with 1:2:2 (inhalation:retention:exhalation) for third week and fourth week which would be followed by 1:4:2.
