In the medical tradition of Japan, Hara refers to the soft belly, i.e. the area defined vertically by the lower edge of the sternum and the upper edge of the pubis and laterally by the lower border of the rib cage and the anterior iliac crest respectively.
“Concentrate the energy on the Hara, the point two inches below the navel. That is the center from where one enters life and that is the center from where one dies and goes out of life. So that is the contact center between the body and the soul. If you feel a sort of wavering left and right and you don’t know where your center is, that simply shows that you are no longer in contact with your Hara, so you have to create that contact.” - Osho