Released on October 1, 2013, is an electropop and trap-influenced ballad by Sia, featuring the R&B vocals of The Weeknd and production by Diplo. Context and Release

The song was originally commissioned for the soundtrack of The Hunger Games: Catching Fire .

The line "thick skin and an elastic heart" highlights a newfound wariness and the strength needed to keep fighting for inner peace. Key Lyrics Sia – Elastic Heart Lyrics - Genius

The "elastic heart" serves as a metaphor for .

Just like a rubber band, the narrator’s heart can be stretched and pulled by pain, but it eventually snaps back rather than shattering permanently.