Sarah Todd Hammer and Jennifer Starzec have known each other for six years now. They've stuck by each other's sides throughout everything, and their friendship is still incredibly strong. Transverse Myelitis paralyzed them several years ago, but they still deal with struggles in their daily lives. Yet with the help of music and each other's support, they are able to push through. Their steadfast attitudes and resilient personalities allow the girls to successfully achieve their goals and live life positively. The final book in the 5k, Ballet trilogy, Up and Down culminates in a story of tenacity and everlasting friendship. A negative experience may have brought them together, but their powerful friendship helps them to move along the rises and falls of life.