Supervisors are often the first to learn about a concern that rises to the level of unlawful behavior. A company's liability risk is determined by the action or inaction of a supervisor. Failing to train supervisors separate from employees is risky business!
Harassment and discrimination training should be relevant to your type of workplace. An office situation is very different from a restaurant or a retail establishment. After each training module will be questions that require a discussion. The discussion is what customizes the training to your business.
Often, people really have no idea that their behavior is crossing a line and making someone feel uncomfortable. Civility is good for business as it levels the playing field and employees are more likely to speak up about concerns. Your employees should realize that they have a personal responsibility to effectively change their workplace for the better.