An article in the November Harvard Business Review recommends the following program for exercising your brain:
Manage by walking about
Read funny books
Play games
Act out (improvisation and acting)
Find what you’re not learning
Get the most out of business trips
Take notes – and then go back and read them
Try new technologies
Learn a new language or instrument
Exercise, exercise, exercise
All good food for thought. The original article is: Cognitive Fitness by Roderick Gilkey and Clint Kilts, HBR November 2007.
You can get a copy of the article here