YK Federation with Dnyaneshwar Chavan Studying and believing in the culture of martial arts and self-defense is a first step. It is India’s oldest and most well-established professional series of the YK Federation under the tutelage of Sensai Dnyaneshwar Chavan (Third Dan Black Belt). Known for his star universal, strong fighters and international standards for training, Dnyaneshwar Chavan is a member of the world’s oldest YK federation organization, the World Martial Arts Federation (YK Federation).