Why is Girls on the Run so much fun? Girls on the Run is so much fun because you meet new friends and you learn how to think about others. I have met a lot of new friends doing this. Girls that I did not know I had a lot in common with. I love running with my friends, because I can get my emotions out and have others there to support me. I’ve learned how to treat others the way I want to be treated and to support others who need it.