I did not know that I was going to be practicing canter zig zig.  I simply warmed up as normal.  We went through all of the familiar exercises, checking in for accuracy and quality.  What I did not know was that throughout the lesson we were stacking my skills on top of each other, making sure the foundation was solid as I worked in collected trot on shoulder-in and trot zig zag, did some single flying changes of lead, and checked for responsiveness by shortening and lengthening within trot and canter.