Let me support that by pointing out that research has found that regular aerobic exercise results in better short-term memory. Since programmers often have to keep multiple things in short term memory, improvements there are very helpful.
in reply to Re^2: Avoiding silly programming mistakes
in thread Avoiding silly programming mistakes
Note that the effect is very specific to aerobic exercise. It does not happen with, say, weight training. The cause is believed to be that regular aerobic exercise improves blood flow, and the brain responds to blood flow.