Starting with introduction of the activities of biomechanics research projects of JAAF in which I was involved, how we conducted feedback of sport biomechanics data to athletes and coaches will be described. I will share ideas to find solutions to some long-standing questions in sport biomechanics and in the field, and to further expand and deepen sport biomechanics. Topics are learning from skilled athletes, exchanging basic and practical biomechanics, i.e. sport biomechanics，expanding sport biomechanics to practice in the field
