If you want to be credible as a fitness instructor, you need to have an healthy lifestyle yourself! What are you working towards these days? Are you training for a race or changing your eating habits to get more lean? Whatever the goal, share how you are taking steps to achieve it. In the same way that you coach your clients, you want the interviewer to see how you are driven and motivated yourself. How are you proactively working to meet your current fitness goal? If they are ongoing, share your daily routine to help you maintain a steady weight and a healthy heart.