Chudan Ryotoken Tsuki is a technique in Kyokushin karate. It translates to 'Middle-Level Double Fist Punch.' This technique involves simultaneously punching with both fists targeting the opponent's midsection or torso. The term 'Chudan' refers to the middle level, 'Ryotoken' indicates both fists, and 'Tsuki' refers to the punching motion. It is commonly used to deliver a powerful and rapid attack to disrupt the opponent's balance and create openings for follow-up techniques.