Within days of each other, Untimately posted this article about Traveller:
Willpower in Traveller
In it he discusses the bonus you get for being less intelligent if you try to up your character's physical stats by training.
And then over on the Conditioning Research blog, I saw this post:
Exercise Makes You Smarter
It's a chart showing some of the increased IQ test and grade level improvements that result from exercise.
So it's "dumb guys get stronger, faster" vs. "exercise makes you smarter." Heh. 70s game design, meet 10s research.
So I'll keep lifting. It'll make it easier for me to remember all the rules to my games. ;)