Answer:
This question is somewhat an abstract answer that regards personal experience, but feel free to use this as an idea. It does not correlate to myself.
When I was younger, I struggled with a speech impediment; it was always difficult to hold conversations with other and I regarded it as a challenge for myself to overcome. When I finally took the initiative to work on it myself, I started holding conversations with myself in the mirror and attending speech therapy classes (with the consent of my parents.) All it took for me to overcome the impediment was to show the desire for change, and now I no longer have to take any speech therapy because the impediment is gone!
Since the prompt doesn't require it to be lengthy it's fairly easy to write anything. If you'd like to write your own try this layout:
1) Introduce the challenge.
2) Discuss the effect of the challenge and how you resolved it.
3) Reflect upon that challenge.