Activities Section Descriptions

When writing the descriptions for the activities section am I supposed to be talking about what the activity was (similar to a resume) or talk about why I did the activity and what it meant to me?

Check out the Essay Guy’s blog post on this topic - you can google. I believe it is more like a resume and adding measurable pieces - ie: one of 4 students elected, recruited X of students to join the club - what was your impact.