SHANIA ANDREWS (Lenora Crichlow) lives on a London council estate and trains for the 200 metres with coach Brian (Phil Davis).
She beats fast-rising Lisa Temple (Lily James) in a qualification race to book her spot at the World Championships.
Lisa is incredulous and her father David (Rupert Graves) – a former Olympic gold medallist – exerts even more pressure on his daughter.
Coach Tommy Southern (Noel Clarke) invites Shania to join the relay squad and she gels with 100 metres veteran Trix Warren (Lorraine Burroughs), Belle Newman (Lashana Lynch) and reserve runners Sarah (Dominique Tipper) and Rachel (Hannah Frankson). However, Lisa runs the relay's anchor leg. Tension intensifies when Shania develops a crush on physiotherapist Carl (Bradley James), who is also the object of Lisa's affections.