Examples in here were helpful to us.
https://www.accesscollegeamerica.org/post/tips-for-creating-a-common-application-activity-list
"the ACTIVITIES LIST is one of the most defining pieces of the application."
"The activities list is a place on the college application reserved for all non-academic pursuits. These things will not be found on a transcript and aren’t reflective of GPA or class rank. "
Example:
"Application Nation’s Sara Harberson suggests that students “give them something different for the position line and the description line. Focus on something that no one else will write in the position line. The more clever you can be, the more you can stand out.”"
"Her examples is a student who starts playing a sport and never makes it to varsity.
They describe themselves as a “JV Player, Suburban High School Girls’ Basketball.” This is accurate, but kind of boring.
Better might be:
“Beginner to Starter in a Flash, JV Basketball”.
Best might be describing it in more “real” terms. “I never thought I would call myself an athlete, but here I am 4 years later starting as the point guard at 5’1! It may only be JV, but it’s my team.”"