My kids' piano teacher recommended this to us and it has been AWESOME to do every day this summer. My kids can do it on their own, and it ensures that they are reviewing their notes every single day.
Looking for baseball practice drills that your kids can do at home? These are our 2 favorite training aids (and they are both available online!) that enable our kids to practice baseball on their own, in our very own backyard. It doesn't get better than that!