Effective trainers are realists.
They have to be. They have to assume that the glow, the inspiration, the new ideas and new skills will gradually dissipate as the workshop becomes a distant memory. It's a safe assumption, but there are ways to ensure that the training holds its value.
Let’s put in a good word for stress. Climbing mountains is stressful, but you’d be struggling to talk some people out of it. It’s stressful competing in tennis or chess. Even watching your local football team in action can be very stressful. Imagine how dull life would be without it.