One of my favorite things to do when I am on vacation is hike in the mountains and take in as much scenery and contact with wildlife as possible. The former requires that I stay in good enough physical conditioning that I can achieve 15+ miles of mountain hiking per day. Therefore, when I am not on vacation, I go for a two-to-four-mile run every day before breakfast. That morning routine keeps me in physical shape and prepares me to undertake the research and writing projects for that day.

During my morning runs, I think about deductions I can draw from recently read research papers, I perform calculations that will be needed for the articles and book chapters I am working on, and I attempt integrations of various Bible texts and science research papers. Sometimes, I get so caught up in these mental endeavors that I end up adding another half mile or mile to my run.

Among Earth’s animals, this capability to multitask by engaging in complex thought while walking, hiking, or running is unique to human beings. A new study published by four Canadian biologists led by Megan McAllister establishes the details and scope of this capability.1

Simultaneous Walking and Thinking Experiments
The team performed a variety of tests on eight adult volunteers. They had the volunteers walk on a treadmill while fitted with an exoskeleton. The exoskeleton was a powered leg brace that the team used to add variable pressure to the volunteers’ lower limbs. While so suited and experiencing variable pressure on their legs at varying treadmill speeds, the volunteers concentrated on listening to a series of tones and evaluating the pitch of each by pressing buttons with either their right or left hands.

McAllister’s team consistently observed that no matter how distracted the volunteers were, they always quickly adopted the most energy-efficient and stable walking strides. On the tonal identification tests, the volunteers scored just as well when experiencing variable stresses on their leg muscles while walking as when they were not experiencing variable leg muscle stresses or when they were not walking at all. The team also noted that the volunteers—regardless of the degree of variable stresses on their leg muscles while walking—were unaware of the changes they made in their walking gait. McAllister and her colleagues determined that finding the most efficient and stable way to walk is an automatic activity that does not disturb complex thinking. They concluded that energy optimization while walking involves implicit mental processing that allows attentional mental resources to be fully directed toward challenging cognitive objectives. As McAllister commented, “When people adapt to energy optimal ways of walking, they do so without having to consciously think about it.”2

Design Implications
The research group discussed how their experiments show ways that post-injury rehabilitation practices could be improved to deliver faster and more effective recoveries. Beyond that application, there are design and philosophical implications.

In addition to the capability of engaging in sustained complex thinking while walking at different rates through a variety of natural and artificial terrains, humans also engage in complex communication with one another. I can recall, for example, hikes I took with Caltech astrophysicists in the Sierra Nevada Mountains during which we would discuss and solve research problems we were working on.

The human capability of engaging in sustained complex thinking and communication while traversing large distances of rough terrain may have been a significant factor in explaining the relatively rapid extinction of nonhuman bipedal primates upon the arrival of humans into their habitats. It certainly would have given humans an enormous advantage in procuring food and shelter. It likely was a major factor in explaining why humans alone, among the approximately dozen different species of bipedal primates, were not trapped in technological stagnation but demonstrated sustained, rapid technological advance.

Purposely Created
The multiple distinct purposes for which God created humans that I discuss in my book, Why the Universe Is the Way Is, require that God endow us with the capacities to multitask in many different ways.3 McAllister’s team has established the scope of one such capacity. I predict that scientists will soon establish the scope of several other such multitasking capacities.

Such advances will continue to add to the accumulating scientific evidence that humans are exceptional—distinct from the rest of Earth’s animals, present and past. We alone are created and designed in the image of God (Genesis 1:26–27). As image bearers we are endowed with the capabilities of managing all Earth’s resources for the benefit of all life. We are also capable of discovering and forming a relationship with God and of being prepared for future endeavors in the new creation.

Check out more from Reasons to Believe


  1. Megan J. McAllister et al., “Energy Optimization during Walking Involves Implicit Processing,” Journal of Experimental Biology 224, no. 17 (September 14, 2021): id. jeb242655, doi:10.1242/jeb.242655.
  2. Quoted by Kathryn Knight in “Walking Efficiently Takes Next to No Thought,” Journal of Experimental Biology 224, no. 17 (September 14, 2021): id. jeb243349, doi:10.1242/jeb.243349.
  3. Hugh Ross, Why the Universe Is the Way It Is (Grand Rapids, MI: Baker Books, 2008), 154–163.

About The Author

Dr. Hugh Ross

Reasons to Believe emerged from my passion to research, develop, and proclaim the most powerful new reasons to believe in Christ as Creator, Lord, and Savior and to use those new reasons to reach people for Christ. I also am eager to equip Christians to engage, rather than withdraw from or attack, educated non-Christians. One of the approaches I’ve developed, with the help of my RTB colleagues, is a biblical creation model that is testable, falsifiable, and predictive. I enjoy constructively integrating all 66 books of the Bible with all the science disciplines as a way to discover and apply deeper truths. 1 Peter 3:15–16 sets my ministry goal, "Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect, keeping a clear conscience." Hugh Ross launched his career at age seven when he went to the library to find out why stars are hot. Physics and astronomy captured his curiosity and never let go. At age seventeen he became the youngest person ever to serve as director of observations for Vancouver's Royal Astronomical Society. With the help of a provincial scholarship and a National Research Council (NRC) of Canada fellowship, he completed his undergraduate degree in physics (University of British Columbia) and graduate degrees in astronomy (University of Toronto). The NRC also sent him to the United States for postdoctoral studies. At Caltech he researched quasi-stellar objects, or "quasars," some of the most distant and ancient objects in the universe. Not all of Hugh's discoveries involved astrophysics. Prompted by curiosity, he studied the world’s religions and "holy books" and found only one book that proved scientifically and historically accurate: the Bible. Hugh started at religious "ground zero" and through scientific and historical reality-testing became convinced that the Bible is truly the Word of God! When he went on to describe for others his journey to faith in Jesus Christ, he was surprised to discover how many people believed or disbelieved without checking the evidence. Hugh's unshakable confidence that God's revelations in Scripture and nature do not, will not, and cannot contradict became his unique message. Wholeheartedly encouraged by family and friends, communicating that message as broadly and clearly as possible became his mission. Thus, in 1986, he founded science-faith think tank Reasons to Believe (RTB). He and his colleagues at RTB keep tabs on the frontiers of research to share with scientists and nonscientists alike the thrilling news of what's being discovered and how it connects with biblical theology. In this realm, he has written many books, including: The Fingerprint of God, The Creator and the Cosmos, Beyond the Cosmos, A Matter of Days, Creation as Science, Why the Universe Is the Way It Is, and More Than a Theory. Between writing books and articles, recording podcasts, and taking interviews, Hugh travels the world challenging students and faculty, churches and professional groups, to consider what they believe and why. He presents a persuasive case for Christianity without applying pressure. Because he treats people's questions and comments with respect, he is in great demand as a speaker and as a talk-radio and television guest. Having grown up amid the splendor of Canada's mountains, wildlife, and waterways, Hugh loves the outdoors. Hiking, trail running, and photography are among his favorite recreational pursuits - in addition to stargazing. Hugh lives in Southern California with his wife, Kathy, and two sons.

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