It was a challenge of a challenge. That is to say, every class from beginner to bolshoi is by default a challenge, but some don't even require establishing a personal agenda* to make it challenging; that is to say, class is what you make of it, so there should be no such thing as a non-challenging class-- but some classes are more challenging than others. A very Orwellian statement.

-petit battements front to back & up and down the supporting leg; with what speed it travels! Like a little mouse running up and down the leg
-balances on releve in all three directions at center with bedroom slipper leg** at 90 degrees or higher
-grand jete entournant: first landing should face forward in the direction of motion in order to establish a forward momentum
-entrechat trois = royale landing in coupe; in general, even-numbered entrechats land in 5th; odd-numbered entrechats land in coupe
-a shutterbug pays us a visit all the way from the Windy City

*examples of personal agendas: one-fingered barre; rib cage; shape of the foot; turnout; pit space/elbows, world domination

**ie: working leg; supporting leg should be clear of warm and fuzzy bedroom slippers that tend to impede balance