Sitting on the Floor in Japan

One of the minor challenges for a foreigner living in Japan is getting used to sitting on the floor a lot. While Western-style furniture like comfortable sofas and chairs can be found everywhere here, it's common for most houses to also have one or more washitsu (Japanese rooms) complete with tatami mats and little cushions to sit on called called zabuton (literally, sitting futon). In my house, we often eat with my wife's parents, with everyone sitting around the kotatsu, a low table with a heater inside for keeping warm in the winter, while everyone grabs from a large pot of food boiling away in the center. Even after living for so long in Japan, an hour or so of sitting on the floor like this starts to get uncomfortable, and I'll usually switch to a nearby chair when no one is looking. I remember when I met my future mother-in-law for the first time: she took me out to experience a really traditional Japanese tea ceremony, which requires that you sit in seiza ("correct sitting") position with your entire body's weight resting on your knees and feet for about 10,000 hours. Japanese always expect that foreigners won't be able to sit for long in that position, so of course I had to summon up every ounce of will I had in me and endure my legs falling asleep without complaint. I guess I made a good impression since she let me marry her daughter.