On June 25, American studies major Casey Rothschild '20 became the youngest woman, and only the third woman this season, to complete the course on NBC's American Ninja Warrior. The 20-year-old, who hails from Holliston, Mass., is a former member of Wesleyan's women's track and field team, where she holds the triple jump record. She trains three times a week at Real Life Ninja Academy in Windsor, Conn., and New Era Ninjas in Hamden, Conn. For the summer, she is working as a gymnastics and circus aerial arts coach at a camp in Massachusetts. After tackling six obstacles, including foam steps, spinning bow…