I really like this idea combined with cheer. Id be cool to introduce gymnastics too! Or just a gymnastic skill in general. You could use to become an acrobat. And be in a circus doing high-risk peforming arts, increasing your martial arts and fame known as the Flying Graysons and after a heinous murder become a vigilante known as Nightwing....ok, too far. :p
American High School sounds fun in general! Its a popular theme in a lot of american book,tv and movies. I think of Mean Girls. Sounds fun to play around with to me