We should move to Japan.

[Brett58]

'In martial arts, the Hara or Dantian is sometimes considered as equivalent to the lower of the three dantian (tanden in Japanese!). Various styles of martial arts describe this as being just below or directly behind the umbilicus.[21] In Traditional Chinese Medicine (TCM) the by-name Dantian is given alternatively to three acupuncture points: the "Gate of Origin" (Ren 4), and the "Sea of Qi" (Ren 6),[22] and, by some, also to the "Stone Gate" (Ren 5).[23] All three points are situated on the midline (centre of the linea alba) of the lower abdomen (i.e. below the navel). They constitute part of the Ren Mai, usually translated as Conception Vessel (CV), which is one of the Qi Jing Ba Mai, the Eight Extraordinary Vessels or eminent energy pathways of the body.'

https://en.wikipedia.org/wiki/Hara_(tanden)

In Neural Therapy, they do injections the bellybutton! Watch this from 5:10
https://youtu.be/TagA8PDTIRM