There are two ways of developing the power of the breath: one way is to make it extensive, and the other way is to make it intensive. After that the breath should be mastered so that it can be directed to any desired part of one's own body; and secondly, it should be mastered so that it may be directed to any side, level, upward, downward, to the right or to the left. Just as one becomes master of aim when one is able to hit the target at any point, so one must master the breath.