(1) Inhale a complete breath. (2) Retain the air a few seconds.
(3) Pucker up the lips as if for a whistle (but do not swell out the
cheeks) then exhale a little air through the opening with considerable
vigor. Then stop for a moment retaining the air and then exhale a little
more air. Repeat until the air is completely exhaled. Remember that
considerable vigor is to be used in exhaling air through the opening in
the lips. This breath will be found quite refreshing when one is tired
and generally "used up." A trial will convince the student of its merits.
This exercise should be practised until it can be performed naturally and
easily, as it is used to finish up a number of other exercises given in
this book and it should be thoroughly understood.