Boost, Paperback/Kathy Mackel

Thirteen-year-old Savvy's three-point shot is deadly. But she gets pushed around on the basketball court. Her older sister, Callie, is on varsity cheerleading, but she's not light enough to be a flier - her coveted position. Both girls need to boost their level of competition to get into the action. How far are they willing to go to be the best?