Aikido man

One day when I visited my sutdent's office, he was unusually very cheerful. He sometimes takes Aikido lessons, a kind of martial arts, very early in the morning before work. On that day, he said that he practiced so much that he had mastered how to do moves without using any unnecessary strentgh. That was the reason why he was so cheerful.
I tried to do a role play with him, called, "how to decline his boss's kind proposal without being rude". He was so happy that he fired joke after joke, the sort that would not be at all polite to a boss, but I couldn't control him....