Does this mean you should only be running?
What should you be doing if you want to be the next Jeopardy contestant, or just outsmart your opponents when the actual apocalypse happens?
Metzl recommends combining aerobic and anaerobic training to reap the benefits of both methods. And whatever exercise you choose, he recommends doing it with intensity.
"The main point here is that the drug of exercise, and particularly the drug of intensity, is probably the most effective brain medicine that we have," Metzl says. "More effective than any drug, any crossword puzzle, or any special food."
If you aren't super-fond of hitting the road to log your miles, Metzl recommends just getting your heart rate up, whatever way you like. "Run, speed walk, yoga, swimming, jump squats, biking -- the choice is yours."