What is the best way to list your extracurriculars on the activty section for common app?

I am not sure what way to explain my extracurriculars on the activity section, it is only 100-150 characters so I have to be brief, do I mention specific details on what I did? I would appreciate any advice on what is the best way to list & approach while staying brief. I have done interns, programs, clubs, research etc