In Kinhin your posture should be upright as in zazen. Your hands are to be held in the isshu position as illustrated below. Move your foot forward as you begin to exhale. Exhale long and fully (the ideal is said to be one minute, but in fact 15 to 20 seconds is long enough). When you inhale, relax the whole body, and at the end of the inhalation, move the other foot forward. The order and size of your steps should be as follows:
If your breath is slower or faster than the others`, it`s necessary that you take bigger or shorter steps to keep the distance between yourself and the others the same.
At the beginning of Kinhin, choose a place that leaves space for the person behind you. Always walk straight and turn by 90 degrees in the corners of the hondo. Walk in one line with the others. When you exhale, put some tension in the arms and the leg in front, as if to exhale through the leg into the earth. Breathe naturally and relax while inhaling. In general, the inhalation should be (much) shorter than the exhalation. But do not force your breath, let it be natural.