I climbed Mt Fuji. It was pretty cool. 3,776 meters / 12,388 ft.
I brought a pulse oximeter out of curiosity. 98% SPO2 at the little base town where we were dropped off. 82% at one of the stops, compared to 95% of the woman working inside. 71% at the peak.
The peak was terrifying. I went up the Yoshida trail and down the Gotemba trail. The Yoshida trail is most populated. Plenty of people hiking and little stops up the trail that will brand your hiking stick for a few hundred yen each ($1-3).
Once at the peak, we had to walk around at the top through a storm to find the Gotemba trail. The storm was brutally cold. I remember there was a guy wearing his girlfriend's dress cus it was the only dry clothes they had while trying to take shelter.
The clouds lingered the rest of the way down. It was insanely foggy.
Overall it was cool. I had the chance to hike it again the next year and opted out.