Sanchin is held as the master kata of all the Naha-te systems and, from all that has been studied in Shizenryu, the root of all kata — a lens through which to study every other. Outwardly it appears the simplest of kata: repeated movements, nothing outside the normal range of motion. That appearance is the first lesson.
Sanchin means 'three conflicts'. To the less initiated, simply the battle between mind, body and spirit — but as you peel the onion, more is revealed. The kata carries the sacred geometry of the circle, triangle and square — in the Zen calligraphic image, creation moving from the unity of the circle, through the triangle, to the manifest form of the square. The old kata carry Buddhist numbers the same way: 18, 36, 54, 72, 108 — each reducing to nine.
Opening & closing — Gassho; dantian; as above, so below; split into a duality, return to one (adults, from 9th Kyu). Footwork — three steps forward and back, using the body to open and close the gates: knees, ankles, feet. Section 1 — single-limb coordination, isometric and isotonic. Section 2 — add the pelvic swivel; use the floor to feel flat back and S back. Section 3 — Samsau: coordinate three limbs at the same time with clearly defined movement. Finally, the complete kata with three ratios of breathing, timing matched clearly to the breath. A full run takes about three minutes.
Uechi-ryu and Isshin-ryu perform Sanchin with open hands, Goju-ryu with closed fists, and some Shorin-ryu branches keep an open-hand version. Comparing them — what changes, and what survives every version — is one of the best study exercises an advanced Shizenryu student can do. In pushing hands, the kata comes alive as Sanchin boxing.