But the brain-the mind-is not a muscle. It needs distinct periods of rest, of reflection, of relaxation to be at it best. If not-like a solider in combat who has simply seen too much- it switches off in order to be able to cope. And then the deeper problems occur.

— On Fatigue by Nicholas Bate

That's my goal sorted for 2012 then. It's something that I frequently do. Always putting things that need thinking in front of getting on the bike or taking my son to the park. No more putting this off. I'm going to start limiting my time on the computer so that I can actually do other things to keep myself healthy.