Demonstrate that you aren't easily discouraged. Where there is a will, there is a way, which is the attitude you want to convey. Explain why your example was outside of your comfort zone. Specify whether you volunteered for this task or if were you challenging yourself. Offer what you did to ensure your success and describe the obstacles you faced along the way. The ideal is to frame your comfort zone as always stepping outside of your comfort zone. This exemplifies the kind of determination to learn, grow, and develop that recruiters are often on the hunt for. Detail how you went the extra mile, and what you learned and applied to your career.

"I remember this time I had to deliver a report to a group of people who were ultimately there to judge my work, and in effect judge me. So I padded the job like never before. If I was going to get up there, I had to anticipate every question that would come my way. I had to be a top expert on what I was about to speak about. This was the culmination of everything I'd worked towards. I was nervous. But I believed in myself, so I focused on that, and convinced myself that everyone would come around if I presented the information well. I believed in myself and delivered my report with conviction. I got a lot of pats on the back for that one. I felt like it was a success because of how I have further developed my skills since that day. It set a precedent which I have outshined repeatedly since."