For me one of the best cycling reads of the year so far is Velo by Paul Fournel (review here) a collection of zen like thoughts on, well, all things cycling. And one I really do recommend for your summer readings.
From one of the brilliant posts, Circles:
To ride a bike is to make circles. You have to think about that when you pedal, as a little reminder the movement of the legs is circular, you have to grant it this and turn the cranks roundly.
Cyclists have a sense of this. As soon as the cadence falls and fatigue mounts they say they are peddling squares.
Cyclists have their own gyroscope, producing not only movement but equilibrium, the faster you turn your legs. the more harmonious this equilibrium becomes.
A cyclists equilibrium is a circular equilibrium
And so it is with sustainability, to keep moving forward, we need to keep circling think Edwards Deming Plan Do Check Act circle,
We need to keep pedalling, we need equilibrium,
The faster your progress, the greater your sustainability equilibrium, where all ‘competing influences are balanced’
If you slow, become distracted or fatigue, sustainability efforts are no longer circular and become square, and if you stop you fall off …
Fairsnape 
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