Expansive power, however, as used in Aikido, can be much greater than your size may lead you to believe. This is because you move with your whole body. Rather than stressing and tensing only a few muscles, you learn to relax and move from the center of your body, where you are most powerful. Power is then extended out naturally through the relaxed limbs, which become almost whiplike in their motion. So Aikido develops the body in a unique manner.
Aerobic fitness is obtained through vigorous training.
Flexibility of the joints and connective tissues is developed through various stretching exercises and through the techniques themselves. Relaxation is learned automatically, since without it the techniques will not function. And a balanced use of contractive and expansive power is mastered, enabling even a small person to generate enormous energy and self-defense skill. Psychological Benefits Aikido training does not view the body and mind as separate. The condition of one will affect the other.