BBC News 2 August 2010
Keeping your heart fit and strong can slow down the ageing of your brain, US researchers say. A Boston University team found healthy people with sluggish hearts that pumped out less blood had “older” brains on scans than others.
In other words jogging keeps also he brain healthy. They dont say anything about a better IQ though : “The participants with smaller brain volumes on magnetic resonance imaging did not show obvious clinical signs of reduced brain function.” May be because a big brain is not really necessary.