ECs are after school jobs, babysitting, playing piano, volunteering, looking after a relative, doing weekly chores at home because a parent isn’t able to do so, gardening, being in a school club, sports, writing stories, and yes, dancing, gymnastics, robotics, etc…
Are you asking your parents to pay for expensive lessons in something, or an experience abroad building schools in Central America? Or are they saying “no,we don’t want you doing any of the things in Lindagaf’s list.”? If they really are putting their foot down about the many unpaid ECs a kid can do,then you should ask for a meeting with your counselor at school and your parents. Perhaps your counselor can help them understand why its good for kids to do things outside of school.
You have plenty of time to find ECs that work with your school and your family. Think outside the box.