A very very doable thing: take a walk. You’ll be in good company; Franz Kafka, Virginia Woolf, Leo Tolstoy, Darwin, Sigmund Freud, Isaac Asmiov, Einstein, Beethoven, Charles Dickens, John Muir, and Steve Jobs all took regular walks to clear their minds or think through problems. Need more reasons to walk? It’s Stanford-approved. It fits into busy schedules. It’ll help you live longer. Now go take a hike.