The suburito is a heavy wooden practice sword—or bokken—developed within Japan’s classical sword traditions as a means of forging physical strength, correct posture, and disciplined movement. Its origins lie in the formative eras of kenjutsu, particularly during the Muromachi (1336–1573) and Sengoku (1467–1615) periods, when prolonged warfare demanded both endurance and technical precision from warriors. Unlike the standard bokken used for paired kata, the suburito’s increased weight resembles that of a real katana, requiring controlled engagement of the hips, shoulders, and wrists through repeated, rigorous solo practice. Historical training customs emphasized daily suburi as a fundamental discipline, believed to internalize correct cutting lines (hasuji) and cultivate mental focus. Over time, the suburito became a core conditioning tool preserved within traditional sword schools and later adopted into modern budō as a symbol of foundational training.