The Egg came first

If the dinosaur propagated using the egg, and over many generations evolved into the chicken, then the egg came before the chicken.

Improvisation is not an exercise

“We know that improvisation is one of the canonical exercises of universal teaching.” – J. Rancière

While I do agree that teaching, whatever the subject, involves a healthy measure of improvising. I would, however, say that improvisation is not an exercise, but a temporal relationship that can be exercised during a given exercise.