Earlier quoted context omitted.
You need an active switch-off. "Relaxing" won't do it, you need to absorb yourself in something totally different
Something physically taxing and which requires complete attention. My best example is skiing. Try to think about a hard problem at work, while doing 15mph on a black slope, and you'll soon be hugging a tree or doing a five point yard sale[1]. Of course, you generally can't ski often enough to relax. Other activities abound. Tennis occupies mind and body, most team sports too. Swimming, cycling and running don't cut i…
If I'm only doing 15, i bet I'm still thinking abut work :P