My dictionary defines this word as :
"moderate or normal psychological stress interpreted as being beneficial for the experiencer"
Generally, stress is considered to be a bad thing but this word teaches us there are positive types of stress.
I think that it is a very important concept for improving our attitude to work.
Good workers use stress from their work to heighten their concentration and accomplish high performance.
So, stress is painful but we can translate it into an opportunity for our improvement.
In Japan, there are many beautiful flowers in the spring like this.