THESE TIMES

This is a story about how to improve your body’s existence. All you need is a floor and a rug. And a wall.

I received an email last week from Nils Marcks von Wurtemberg, a friend a few years older than me. He lives in Sweden.

His email reported his latest adventure … and its aftermath:

“We have minus 13.5 degrees Celsius today in Stockholm. Tomorrow it will be colder. … Last Sunday I skated 40 km on the Baltic Sea with my long ice skates on quite soft ice, which was awful. I have never been so tired in my whole life. Took me three days to recover. If the ice had been hard and if the wind had c...