ohhnooo I might have got it wrong then since it said extra circulars I wrote things like volunteeringYeah I wrote like 100 words for leisure interests (cooking, running, sports). I don't see how much you can elaborate on non-position of responsibility extracurriculars (you can't really do STAR stuff). Then I did 300 for the other question.
I don't think they actually expect 500 words for each of those, I think it's more just they're giving you the freedom to express yourself however you want. Although, I am curious why they didn't just combine those two questions into one...