Seiken Chudan Oi Tsuki is a punching technique used in Kyokushin karate. It translates to 'Front Punch to the Midsection (Lunge Punch).' In this technique, the practitioner steps forward explosively with one leg while simultaneously delivering a punch to the opponent's midsection (chudan). The punch is typically aimed at the solar plexus or the lower ribs. The forward momentum generated by the lunge adds power to the punch, increasing its effectiveness. Seiken Chudan Oi Tsuki is often used to close the distance between the practitioner and the opponent, allowing for quick and powerful attacks. It requires proper coordination of footwork, hip rotation, and arm extension to deliver a swift and impactful punch.