Only the Aizu clan lord and chief retainers could learn these techniques and only after many generations did it become known outside this group. As Morihei Ueshiba aged and altered these techniques for older people,the highest ranking of his inner circle students, Gozo Shioda, broke away forming Yoshinkan Academy of Aikijutsu, thus preserving the ancient technique of Renaissance Samurai. The kind of dynamic training we aspire to is meant to simulate real encounters. As we heighten our senses of observation and response time to a level of reaction speed, our whole being benefits from the experience. Vigorous training obviously must start slowly yet, little by little, our bodies readily accept this format.
Movement is what the physical body was made to do.
Psychologically, the mind also sharpens its awareness in all of its processes and tasks. We literally begin to think more clearly. This symbiotic mind and body nourishes one's whole being. This kind of training is so vitally important because in real situations of attack and defense, one must be able to respond naturally, like spontaneously running from a falling rock. We train vigorously to simulate that occurance.