In the context of training for a marathon, I have wondered more than once whether running three miles on a Monday really gives me any tangible benefit.
As if to answer my question by analogy and knowing that I have no fee-paying projects right at this moment, one of my colleagues called me this morning to pique my mental faculty with some interesting thoughts and ideas. These ideas might not pay the bills, but they keep my brain muscle exercised in the way that my little Monday runs do for my legs.
So even though my legs took me 15 miles yesterday, I had a quick 3-mile run on the machine this morning. 25 minutes 47 seconds.
Now to do the same for my head.