Doesn't matter what you mention, so long as you link them to your degree course.
It can have no direct link to your course either.
e.g. Let's say you were applying for Chemical engineering and you had been captain for a team for a season.
You could say: During x season for x league, I was the captain for my team. Being a captain for the team required discipline, good motivation towards my team members and leadership skills. These traits would make me a good applicant for the chemical engineering degree as this experience has given me an insight into working as a team etc...
get the drift?
It doesn't matter wtf it is, just link it well.
Here's how you should do it?
-What you did?
-What it taught you?
-What skills did you gain from it?
-How will those skills help you during and after your degree.
Follow the tips in this video religiously and you'll be fine:
[video="youtube;JWxFVtSUAsQ"]https://www.youtube.com/watch?v=JWxFVtSUAsQ[/video]