A new study shows hiking grows brains in middle-aged adults.

You momentarily forget where you set down your keys—and you just happen to be over 50 years of age—and you can already hear in your mind the jokes that will ensue: you’re having a “senior moment,” you’ve got “old-timer’s” or “well, age happens.” If scientists are right, however, maybe you should just forget about that car altogether and, instead, take a hike.

According to a study recently published in Proceedings of the National Academy of Sciences of the United States of America, an online medical journal of the National Academy of Sciences, hiking or walking grows brains. In an experiment, a group of middle-aged adults were asked to take three 40-minute walks a week for a year. At the end of the 12-month period, MRI scans verified that their hippocampi grew, on average, by 2 percent. Typically, the hippocampus gets smaller once a person hits his or her mid 50s, leading to memory loss. And preventing such shrinkage could improve a person’s retention for years.

This new study can be added to the long list of other recent reports that have come out regarding how beneficial the outdoors are for us, including ones that show that green settings are good for a number of ills and that being outside makes us more pleasant to be around.


Spending time outside is beneficial for our health and well-being.

So, if stress, depression, anger and aggressiveness are all lessened in natural, green settings, nature makes us nicer and our brains grow, what are we all still doing inside?

Your brain on travel

According to the U.S. Environmental Protection Agency’s Office of Air and Radiation, on average, Americans spend about 90 percent or more of their time indoors. And 65 percent of that indoor time is spent in our own homes. For two-thirds of our average day, we sleep, eat, work and watch television—for most of us, all indoor activities. Only about half of Americans exercise regularly (at least three sessions a week for 30 minutes at a time).

The great thing about travel is that it gets you moving and outdoors. And if you choose adventure travel, which is usually even more active, the benefits compound.


Just being outside makes us more pleasant to be around.

Travel is an especially good way to stimulate your brain. It worked for our ancestors, the early Homo sapiens sapiens. They colonized the world, while Neanderthals (Homo sapiens neanderthalensis) confined themselves to a smaller area centered around the Mediterranean Sea in Europe and Asia. Home sapiens sapiens’ wanderings provided a tremendous stimulation for their brains that led to the development of superior tools and survival skills. The now-extinct Neanderthals were likely just out-competed and marginalized by their more well-traveled contemporaries.

The power of thought

But there are results from another new fascinating experiment. Researchers at the Cleveland Clinic discovered that just thinking about exercising a muscle could strengthen it.

For 12 weeks (five minutes a day, five days per week), 30 healthy, young adults were asked to imagine either using the muscle of their little finger or of their elbow flexor. The participants were asked to think as strongly as they could about moving the muscle being tested and to make the imaginary movement as real as they could.


Imagining where we’ll go next is an exercise in adventure.

Compared to a control group that did no imaginary exercises and showed no strength gains, those who thought about using their little fingers increased their pinky muscle strength by 35 percent. The elbow-flexor thinkers increased elbow muscle strength by 13.4 percent.

What’s more, brain scans taken after the study showed that the participants had greater and more focused activity in the prefrontal cortex than they did before. The researchers stated that the strength gains were due to improvements in the brain’s ability to signal muscle.

It would seem that what all these new studies are showing us is what our ancient ancestors knew all along and what down deep we’ve probably intuitively known, too: the outdoors is good for you.

What we may not have realized, however, is that just imagining where we’ll go trekking next could be good exercise, too.

Here’s to finding your true places and natural habitats,