Based on the 2015 boxing documentary "T-Rex" by Zackary Canepari and Drea Cooper, "Flint Strong" will tells the story of 17-year-old Claressa 'T-Rex' Shields (Ryan Destiny), a Flint Michigan native whose dreams of becoming the first American woman in history to win an Olympic gold medal in Boxing are realized at the 2012 Summer Olympics in London.