Having athletic talent seems to be something of a family trait for the Stokkes. Allison got all of the attention, but her brother David has skills of his own. He represented the USA at international level in amateur gymnastics.
David was something of an inspiration for Allison; it's very hard to achieve a national rank as an amateur gymnast, and his success pushed her forward. She even tried gymnastics herself, but it wasn't for her. Her future involved a very different athletic discipline.