This is Your Brain on Exercise (2017)

Tom Bullock and Barry Giesbrecht, a professor of psychology and brain sciences at UC Santa Barbara, work in one of the few labs that have managed to measure the effects of aerobic activity on the visual cortex during exercise. Maddock and his colleagues used MRI to measure levels of neurotransmitters in study subjects after a bout of exercise on a stationary bike and found that levels of glutamate and GABA—two of the most common neurotransmitters in the brain—had increased. A 2016 study from the University of Arizona, for example, found that cross-country runners had increased connectivity between parts of the brain involved in memory, attention, decision-making, multitasking, and processing sensory information—the very same regions that tend to be hit hardest as we age—compared to healthy but sedentary controls.

Source: www.outsideonline.com