The forms we use to train the body in Zen – how to sit, stand, and so on – can be described in general like this: the energetic currents of the body are gathered with the breath at the tanden and in the lower portion of the body, the sacrum drops, the spine extends upward, and the eyes are used broadly and with sharpness. There are several effects of this, but we can essentially say that a downward settling or grounding is combined with an upward lift or extension. The body thus integrated, these two forces balance or cancel one another. In this condition the mind easily enters samadhi and kiai – vital energy – radiates. We should understand that such energy is not produced somehow from practice, but rather flows through the body-mind when it is balanced in these ways.