Heian Nidan is often the second kata learned in Shotokan karate, and it builds upon the foundational techniques of Heian Shodan by introducing more dynamic and complex movements. Its history ties back to Okinawan karate, with Anko Itosu crafting this series to simplify the teachings of older, more advanced katas. The bunkai of Heian Nidan focuses on defensive blocking followed by quick, decisive counterattacks, and introduces the practitioner to more dynamic techniques like kicks and jumping strikes.