He specializes in kendo, a Japanese art of fencing. With the study kendo as a start, he has deepened exchanges with players and coaches in other area of sports and has developed his own biomechanical theory. Currently, he is actively writing, coaching, and conducting seminars with sports related topics such as bowling, baseball, soccer, swiming, and others. He has published many books about sports in the past. His homepage is www.namiashi.net.