A sales trainer is someone whose responsibilities involve teaching sales associates effective strategies for negotiating with customers and closing sales. In this career, you teach associates about new tools to increase output, educate them on new products, and ensure their knowledge about the company’s products is up-to-date and comprehensive. As a sales trainer, you have to lead by example and show how closing a sale occurs. Your job duties also involve keeping track of the performance of members of your team and determining who needs extra assistance.