Ian Altman discusses the importance of role play in sales, emphasizing that top performers practice more than they perform. He identifies three common mistakes: not role playing at all, lacking structure in role play sessions, and providing overwhelming feedback. Altman suggests a structured approach with three roles: salesperson, customer, and observer, using secret cards to introduce variability. Each 10-minute role play session involves feedback from all three roles, focusing on one key improvement area. This method, practiced consistently, can significantly enhance sales skills and confidence.