I got this yesterday and had to post the link here. It's written by Jeffrey Gitomer, who if you don't know is the author of several books on art of Sales. "Why do you follow a sales writer?" you might be thinking. Everything in life is about selling, maybe not actual items or property but life is all about sales. Remember the scene in Tommy Boy where Chris Farley's character convinces the waitress at the diner to bring him the chicken wings even though the kitchen was closed? She 'bought' the idea that she should get him the wings.
Anyway, it's a great article and it applies to training - so read it.