Two weeks without tennis wasn’t SO bad, because at least I was walking and climbing steps each day during sightseeing in Japan. My first week home, I played tennis four different days, and though I am still jet lagging, and almost collapsed in the third and fourth sets two days after returning, my game and energy improved greatly by the end of the week.

Now here is an article suggesting an emerging scientific view of human evolution: we are clever today in part because a million years ago, we could outrun and outwalk most other mammals over long distances. Our brains were shaped and sharpened by movement, the idea goes, and we continue to require regular physical activity in order for our brains to function optimally.

Later on, the author writes, if physical activity helped to mold the structure of our brains, then it most likely remains essential to brain health today…Recent studies have shown that “regular exercise, even walking,” leads to more robust mental abilities, “beginning in childhood and continuing into old age.”

Well looking at Buddhist temples and gardens for six hours a day in 40-degree weather sure took its toll on me…I was often exhausted. And I suddenly became aware of all the people behind store counters standing all day to earn a living. I basically sit a lot, writing or reading on the computer. Tennis stamina aside, I am definitely not used to being on my feet for hours and hours. However real physical body movement is now a regular part of my life. It’s good for health and stimulates my brain. Are you keeping active? And fiddling with a TV remote or game controller does not count as useful physical activity!