Sochin (壯鎭) (Japanese: “Tranquil Force”) is a kata practiced in several styles of karate. It may have derived from Dragon style kung-fu, and was taught in the Naha-te school in Okinawa by Seisho Aragaki. It was then passed down to Shito-ryu. A variation of it was introduced into Shotokan by Gichin Funakoshi’s son, Yoshitaka.
The rhythm of the kata is dynamic, it is characterized by slow, deliberate movements interspersed with explosive out-bursts of speed. In the Shotokan version, the powerful dominant stance in this kata is sochin-dachi (“rooted stance”). In the Shito-ryu version, it employs several stances including nekoashi-dachi (“cat stance”) and zenkutsu dachi (“front stance”). Rhythm is important in the execution of this kata. This kata has been said to develope Chi/Ki energy.