When you think about it, dancing is a fairly odd activity. It’s one of the few things both a trained professional and an exuberant amateur can perform and receive positive feedback from onlookers. No amount of cavalier zeal qualifies an untrained person to perform invasive surgery. It doesn’t matter how much someone just wants to “express themselves”, if their idea of cooking is dropping something into a pot, turning the burner to high and coming back in twenty minutes. But...