Why does walking make us feel good? We all know that a satisfying stroll changes our outlook. Perhaps we realize it all the more today, when so many of us are hunkered down and this simple activity is a challenge. But walking is especially important now, with gyms and team sports shut down. What we usually do automatically now takes serious intention. Even how we walk has temporarily changed, especially for city-dwellers. Our brains are quickly calculating where the other person is, getting ready for a passing encounter. It benefits us on many levels, physical and psychological. Walking helps to produce protein molecules in muscle and brain that help repair wear and tear. These muscle and brain molecules—myokines and neurotrophic factors, respectively—have been intensively studied in recent years for their health effects. We are discovering that they act almost as a kind of fertilizer that assists in the growth of cells and regulation of metabolism. They also reduce certain types of inflammation. These essential molecules are produced by movement and the increased brain and body activity created by movement. Walking is essential to our nature. At around a year or so of age, we make a unique transition from crawling, from being stable on all fours. We struggle upright, falling a bit, stumbling a bit and eventually walking fluidly and fluently under our own steam. In our evolutionary history, walking upright set our hands free, allowing us to carry food and tools and children and also to point and gesture. Because we could point to predators and prey in the distance, we could look in the same direction, paying shared attention to what someone is pointing at—a capacity that demands an elaborate brain system. Walking is also how we find our way around the world. This gives the lie to how we might think we navigate—that is, by sight. People who are completely visually-impaired, even from birth, can and do navigate with purpose and direction. They can do this without sight because the experience of bodily movement itself in complicated three-dimensional space is key to creating our cognitive maps. Those of us with normal sight are fooled by our sense of the three-dimensional world as visual, but to our brains, vision is just one sense contributing to our understanding of space. After all, we can find our way around in a suddenly darkened room. Moving is the thing. It silently updates your position in your GPS without your even realizing it. Movement through the world changes the dynamics of the brain itself. Recent experiments show that walking increases the strength of the signals in parts of the brain concerned with seeing and other senses, such as touch. Experiments by the psychologists Marily Opezzo and Daniel Schwartz of Stanford University have shown that walking boosts creativity. They asked people to quickly come up with alternative uses for common objects, such as a pen. They found that people whom they got to walk before coming up with alternative uses came up with almost twice as many novel ideas as those who remained seated. Before you start a creatively demanding piece of work, prime yourself by writing down a few questions about what you need to do. Then head off for a minute stroll and bring a voice recorder or a notebook. Granted, going for a walk acts against our in-built tendency to conserve energy. Remember, for most of our history, food was hard to come by. After a long day walking and foraging and hunting, our forebears would sit and maybe tell stories or sing songs. We no longer walk mile after mile to gather food. Instead we can sit and eat, easily. Perhaps too easily.
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