We are used to thinking of intelligence as largely a matter of genetic inheritance, but that is not the whole picture. What you do affects your mental well-being: staying physically and mentally active helps us stay sharp as we age.
Nevertheless, our personal efforts to bolster cognitive enhancement cannot forestall all declines in our cognitive performance.
What is especially surprising is the powerful link between physical activity and mental acuity. Staying fit helps us keep cognition more robust as well.
clipped from: www.scientificamerican.com