These ideas are ways to start thinking about leadership. You’re unlikely to use these as evidence of leadership skills in a written application, but they might be things you reference in conversation at interview.
Suggest activities to do with your group of friends, and make it happen. Don’t just be responsive.
These are all quick ways you can start developing leadership skills, and you could refer to in applications.
Gather a team together to enter a competition, or a charity run.
Become a “parent” for Freshers in your college or department.
Organise a holiday for yourself and a group of friends.
There aren’t many short-term leadership activities you can do: most require commitment. However, in order to be a leader, you normally must get heavily involved in a team activity! See opportunities for developing teamwork skills in the last section, below.