You would think this was a no-brainer but actually it seems that the genetic component that makes human beings able to work effectively is somehow tied to a dour facial expression so that when people concentrate they also tend to frown. Now why this is so...I don't have the foggiest....but I know that when I frown everyone tends to think I am mad even when I am just working hard.
So, like every other opprotunity for teaching our kids about the world, it is nice to clue them into to subtle body-language realities like this and prepare them...or at least give them a conscious understanding of what is happening and how people around them preceive them. Most people are put off by frowns, groans, utternces of horror, ect... so when a child is asked to do a job and they immediately roll their eyes, slump their shoulders, melt at the knees...it sends a message. Kids don't really want to be disliked or thought of as poor sports and babies...so it is helpful...without a sermon tone to just tell them what is happening when they react to work requests with a poor attitude. But even more importantly, it is vital that parents model for their children the right way to respond to work...unexpected and even unpleasant requests. When an adult smiles and nodds and uses a pleasant tone of voice they proclaim to the world that they are star quality, capable of handling what ever is thrown at them and doing it with grace and charm. Those are the people who make the world a better place. Those are the people we respect and admire.
If we have the dream of leading our children into a bright future it is wise to teach them to smile despite the day's trials or tibulations...after all...if we love them we want them to grow in goodness and that means always striving to become better people.