As I stated in Bodyweight Training and Stretching, in Chapter 14, we have a different perspective on being fit in Japanese natural health. Being fit means having flexible muscles and joints, not necessarily having big muscles.
While bio-hacking is more science and technology-oriented, bio-harmonizing in the Ikigai Diet is keeping a balance between ancient wisdom and modern science. I incorporated many aspects of Japanese natural health into the Ikigai Diet. Zen Shijin diet, ancient Japanese martial art, healing methods such as Shiatsu, Seitai, and acupuncture are all part of Japanese natural health, which was initially influenced by ancient Chinese medicine.
I just had a session with Dr. Hirai, an acupuncturist, a chiro, and a total bodyworker who is also a master of an ancient Japanese martial art. He is the one who introduced me to Nordic walking and told me about the posture. He comes to our house all the way from Fukuoka once every two months to give sessions to people in Hino.