When I was living in Japan in the late 1990s and again in the early 2000s, I recall walking a lot every day. I felt healthy then not just because I thought I ate well but I had a lot of exercise, too. I consciously walked and jogged in the mornings and/or afternoons depending on the weather. And my commute included walks between my train station and the university. The following article seems to support what should be a healthy lifestyle without gym time.
Okumura, K. (November 6, 2020) “How Japanese People Stay Fit for Life, Without Ever Visiting a Gym,” Medium.com, https://kokumura.medium.com/how-the-japanese-exercise-to-stay-youthful-be2d6105e6e6.
I tried to estimate the number of steps I took on average each day. It seems I could easily make more than 10,000 steps everyday as I usually walk more than 6,000 steps for my commute and the typical walks in and around campus (including lunch time strolls with friends). My morning and afternoon walks can match this 6,000 steps. These can even be more during weekends when I’m out in the city or in Tokyo to be with friends. These steps seem nothing then and I loved to walk around partly to keep my sanity while studying there.
When I was visiting researcher later at another university, my step count was about the same if not higher. The only difference perhaps between Yokohama and Saitama was that I had a bicycle when I was in Saitama. The bicycle increased my range and I took the bicycle lent to me by friends to dome groceries or explore the nearby wards. Those were the days, I guess, that I wished I still have now in terms of more active transportation.