Abdomen ' Gravity and mass in the human body, traditionally considered in Eastern thought to be the seat of the soul and center of ki.
Center of the drumhead Hara literally means 'belly.
One's center of mass, located about 2' below the navel Traditionally this was thought to be the location of the spirit/mind/ Aikido techniques should be executed as much as possible from or through one's hara.
Abdomen' Gravity and mass in the human body, traditionally considered in Eastern thought to be the seat of the soul and center of ki.