Sport

I don't know, but exercise seems linked to cognitive function. (Type "exercise" into the search box.)

I'd be cautious about any activity that causes impact to the head though (like boxing or American football). It's seems like head trauma is not good for cognitive functioning.

No problem -- sometimes it's difficult to find old posts, so it's always okay to ask when you can't find something. :)

Here are some more links that might be interesting:

Hits to the Head May Result in Immediate Brain Damage

When a teenager is hit in the head, his brain can begin to show signs, within days, of the kind of damage associated with degenerative brain disease, according to an unsettling new study of young men and head injuries.

Brain injury found in 99 percent of donated brains of NFL players in new study

This new study, published today in the journal JAMA, is the latest linking dangerous head injuries to football, though the authors note that the true risk may be lower than the results suggest.

Chronic traumatic encephalopathy, or CTE, is the term for brain damage that occurs after repeated blunt impact, like head tackles in football. Previous research has shown that CTE is linked to — among other things — memory loss, depression, and dementia, and in recent years it has become a point of controversy within football.