The Heart Is a Muscle

"The Heart Is a Muscle" is a song by Australian alternative rock band Gang of Youths from their second studio album Go Farther in Lightness (2017). It was released as the album's fifth and final single on 29 November 2017. The song was written by band frontman David Le'aupepe, and it placed third in the 2018 Vanda & Young Global Songwriting Competition. "The Heart Is a Muscle" also peaked at number 37 on the US Adult Alternative Songs chart, becoming the band's first charting track on the chart. It achieved certified gold status in Australia in 2019.

A music video for "The Heart Is a Muscle" was released on 29 November 2017. At the ARIA Music Awards of 2018, its director Patrick Rohl received a nomination for Best Video.

The song was used by Fox Sports (Australia) to promote the 2018 NRL season.