Older people get a brain boost from exercise, but too much might be a bad thing

Two studies recently showed how exercise provides a boost to mental acuity. Those who engaged in more moderate activity did better overall on brain function tests, and those who did more strenuous exercise throughout the years performed more poorly on the tests. Researchers noted that though long-term strenuous exercise has a protective effect for breast cancer, it could have harmful effects on cognition, although larger-scale studies are necessary to better understand the implications for recommending activity and lifestyle regimens.