Inhalation and exhalation must be very slow
and with uniform speed. The following practices
will clarify this point.Suppose you are
inhaling 2000 c.c. air in 4 seconds during
your practice, normally one inhales about
1000 c.c. in first second, 500 c.c. in second,
300 c.c. in third and 200 c.c. in fourth.
This is not correct. One should inhale 500
c.c. per second from 1st to 4th. This shows
that your inhalation speed is 500 c.c. per
second. If you are exhaling the same air
in 8 seconds then your speed should be 2000
/ 8 = 250 c.c. per second. When the time
of exhalation is doubled the speed should
be halved.