Victoria is adjusting to life as the mother of twin eight-month-old girls when she receives the news no one wants to hear: she has breast cancer.

Suddenly, the new mom and amateur mountain bike racer is confronted with a tidal wave of information and raw emotion. Still reeling from the diagnosis, she is expected to make life-changing decisions about surgery and chemotherapy-all while attempting to process her fear, anxiety, and confusion.

But Victoria chooses to battle breast cancer with the same intensity she approaches any of life's speed bumps. Tenacity, humor, a willingness to...