Actress Lily James went to extreme measures to make sure her voice was in tip-top shape before filming for Mamma Mia 2. In the sequel to the beloved 2008 film, which centres around the music of ABBA, James portrays a young version of Donna (played by Meryl Streep), and sings along with her group The Dynamos, reports people.com.

Just days before the film hits theatres on Friday, James revealed that she's "struggled" with her voice a lot since leaving drama school. "I lose my voice a lot," she said. "I have issues — it's really scary and heartbreaking," she said,