It's things like positions on committees of societies, organising events, perhaps any foreign travel projects you've worked on (i.e. not general travelling but one where you acted as a teacher, conservationist, etc).
Do not repeat your work experience.
If you don't have ANY of these I'd suggest you get some. I say this because interviews are often heavily competency-based, so you will be asked a lot of questions which relate to these positions of responsibility. It might be a struggle to answer these questions, and indeed secure an interview, without any positions of responsibility at all. These are basic tick-box requirements for law firms when deciding which applicants to interview, so a lack of them may set alarm bells ringing with recruiters.