"All of a sudden a light bulb comes on in their heads and it appears easy."
I like to call that the A HA! moment. It's my favorite time because it's like the work you were putting in all the sudden is understood and my dog gets excited because he realizes what he was supposed to be doing. Makes me proud!
Even though I'm still in the infancy of training, I still love those A Ha! moments with the simple commands I've been teaching. Good stuff.