Modernization has pushed us into a sedentary lifestyle; yet, managing physical activity has become an indispensable part of the preventive approach in healthcare. The scientific literature supporting the health benefits of walking is abundant, but we are systematically forced to spend most of our day confined to a cubicle, seated and staring at the screens of our computers. Amidst all this, this book explores the idea of how a simple intervention, such as walking, can make a positive impact at both the individual and societal levels.
The origins of walking are embedded in our evolution when Homo sapiens diverged as a bipedal species from their ancestral cousins, who were quadrupedal. Bipedalism enabled humans to climb trees, conserve energy (of course, walking on four limbs uses more energy compared to walking on two), and freed up the hands for tool use. In addition, evolution ensured bigger lungs and efficient sweat glands that enabled humans to walk longer distances. Around 60,000 years ago, our ancestors walked out of Africa and migrated across the globe, walking an average of 17 km per day and intermingling with the populace back and forth.
Human progress and urbanization have reduced the need for walking, and studies from different cities across the world suggest that populations engaged in walking have better health outcomes compared to those who walk less. Today, more than 50 percent of the world’s population lives in cities, and by 2030, more than 80 percent will be living in cities. However, modern city planning is not conducive to pedestrians, and there is a need to incorporate cycling lanes and footpaths into our urban planning.
Several case-control studies have highlighted the benefits of walking, ranging from better heart health to enhanced memory. Psychological studies have noted the role of walking in creative thinking, lowering the risk for depression and better mood. Body posture and walking are linked with neural networks and blood flow in the brain, while sitting for long hours leads to decreased muscle mass. Our bodies need aerobic exercise, and walking is comparatively easier than jogging or running. Risk assessment studies have shown that the risk of injury from walking is significantly lower than from running.
“The core lesson of this book is this: walking enhances every aspect of our social, psychological, and neural functioning. It is the simple, life-enhancing, health-building prescription we all need—one that we should take in regular doses, large and small, at a good pace, day in and day out, in nature and in our towns and cities. We need to make walking a natural, habitual part of our everyday lives.” As someone who takes frequent walks between work and long walks at least twice a week, I found this book to be an intriguing read, especially because it was written by a neuroscientist whose research focuses on walking.