How did the instructor make douglas a good swimmer?

Question: How did the instructor make douglas a good swimmer?

The instructor likely achieved this by teaching Douglas the fundamentals of swimming technique, such as proper body positioning, balancing techniques, body roll, and breath control. Additionally, they likely worked with Douglas on developing strength, fitness, and endurance, as well as focusing on specific drills and exercises. Finally, the instructor likely encouraged and motivated Douglas, praising his successes and providing him with feedback and guidance, in order to help him develop as a swimmer.