There was a time when walking was a standard medical treatment.
In her book Your Brain on Nature, Dr. Eva Selhub of Harvard Medical School notes that health resorts and “sanitariums” sprang up in newly urbanized America during the Industrial Revolution of the 1800s.
There, doctors would treat patients with long nature walks. They saw walking as an antidote to sedentary city living.
But walking suddenly fell out of favor in the in the early 20th century.