Japanese people are really interesting. I discovered this on the plane.
In America, people tend to stay seated on planes. If they happen to get up at all, it's usually to use the restroom or stretch their legs for a minute or two. But in Japan, they use it as their own personal gym and playpen. I watched in amazement as an elderly Japanese woman jogged laps around the seating area and a Japanese businessman high-kneed his way down the aisle. There was a Japanese mother with two little boys. She held one of them the entire time, bringing it from window to window to look outside. Her other child, however, ran free...and by that I mean he literally did sprints the economy cabin.
And so, Japanese people move on planes.