The interview linked here is a rare conversation with Koichi Tohei Sensei, 10th dan, conducted during the summer of 1965 in Los Angeles during his USA tour. At that time, the publisher of Black Belt magazine was its founder, Mito Uyehara, a practitioner at the Los Angeles Aikikai.
“I definitely keep my one point at all times. If you do it only in the dojo, you cannot develop your ki because the training you receive in the dojo is too short. Only an hour or two a day is not enough. You must do it until it becomes a part of you and you do it naturally – unconsciously like breathing. Too many beginners do not really understand and keep concentrating on the one point (a point 2 inches below your navel) almost in a physical manner. They look at their expanded bellies and think they are doing it right. They do not understand they must concentrate, not intensively, but calmly.”