They must improve. Some people believe that improvisations are field days for the uninhibited. This belief attracts some wild and insensitive personalities to improv sessions while it repels the more serene and complacent types. An improvisation should never be out of control or physically dangerous for anyone. Blind abandon and bald inhibition have nothing to do with improvisation.
Most people think of improvisation as a theatrical exercise.
Heading over to the theatre for an eight-o'clock curtain, you can never be quite sure how the next few hours will unfold. Your nerves are on edge. Nowhere and at no time is the novelty of every moment more apparent than when you take your place on stage and wait for the curtain to go up. And the minute you step out on stage, you are almost bowled over by the power of that moment, the thrill of being the center of attention. Everyone, the audience as well as the performers, feels the significance and the intensity of this moment.