This is a linkpost for http://squirrelinhell.blogspot.com/2016/03/abuse-of-productivity-systems.html
Actual example: go for a run. Difficult to start but easy to keep running for the duration of the run.
I think there is a physiological component to this in addition to motivation.
I have moved this post to my blog: http://squirrelinhell.blogspot.com/2016/03/abuse-of-productivity-systems.html