There are four activities that might strengthen your mind. A few different research studies showed that activities such as doodling, practicing yoga, running barefoot, and spending time in nature may help improve memory. “If you were one of those students who was more likely to doodle in the margins of your notebooks than write words in them, you may have been onto something… Those who chose the drawing route remembered about twice as many words as those who wrote them down.” In another study, “Both groups showed statistically similar improvement in verbal memory, but the yoga group also showed an improvement in visual-spatial memory (where you left your keys, for example) as well as in signs of depression and anxiety.” A separate study found that “…barefoot runners who were told to hit these targets showed a roughly 16 percent improvement in working memory… this effect may result from the combination of the increased blood flow that running produces and the forced focus that comes from hitting targets.” And finally, a fourth study reported on the benefits of the outdoors: “…people who stepped outside into a natural or parklike environment showed improvement across a host of cognitive functions — including memory — compared with those who were stuck in a city.”