http://www.medifasthealth.org/blog/2011/03/22/the-best-brain-exercise/

 When you run down the list of benefits of exercise, you probably hit all the major perks, like weight loss, a reduced risk for heart disease and cancer and a faster metabolism. But the benefits of aerobic exercise go beyond the body: Regular sweat sessions can also keep your brain healthy.

http://goarticles.com/article/Get-Sweaty-Get-Smart/4152741/