Any example from school, work, or extracurriculars is fine. Describe the context of the team’s goals and how you arrived into a leadership position. Elaborate on the challenges you faced and how you overcame them. Make sure to communicate clearly and provide tangible details on both the challenges and the steps you took to overcome them.
Finally, speak about how your efforts led to a positive result; if you can quantify this result, that’s even better, although it’s not necessary. Conclude with what you learned and gained from the experience.