Lower back pain of Hell

Hello fellow travelers. I wrote this while commuting from Nara to Kyoto, and I come here begging for advice for the infamous Lower back pain of too much walking.

Yes, I know it might be a medical thing, and it’s not a “Japan thing” (I had it a while back in Rome one day, but not as bad), but I am sure I am not the only one who is suffering this from walking 20.000+ steps every day for several days.

I am 43 years old, I go 5 times a week at the gym and sometimes jog at the park for pleasure. It’s true that I rarely make the 20k steps outside of a vacation like this.

Any times? Thanks fellow back painers.