LONDON, Oct 18 — American actress Sydney Sweeney transformed into former professional boxer Christy Martin for the biopic Christy, which chronicles her life in and outside the ring.

Directed and co-written by David Michod, the film tracks two decades of Martin’s life. During that time, she stumbled into the sport and, by virtue of her raw talent, turned into one of the most successful female boxers of the 1990s.