Recently I learned a new trick to really crush it with your video ads.
Instead of targeting interests like martial arts, parents, etc, target competitors.
When setting up your video ads you can target other pages, so if you are a BJJ school you can target all of the local martial arts school pages, you can target local softball clubs, you can even target a local dave and busters, etc. Anywhere where kids and parents would go.
Not all pages will be targetable so then you have to resort to interests. But give it a try.