Many of Chan Marshall's songs are centered around making difficult choices when alone. This song is a case in point. She explained in a BBC 6 Music interview: "When I wrote Metal Heart there was a place that I couldn't move from. Not trapped, but my choices were limited and there are different things we can do when we are forced to suck it up or kneel down or whatever. We have a choice to make and I think Metal Heart, just writing that song those were words from my subconscious forcing me to get up, to not choose to let any pain take me over. That song was about a hymn to, even if you feel you are in the darkest, most alone corner of your life at that point I just knew that I wasn't."
The song was included on the soundtrack of the 1998 American comedy-drama film Desert Blue.
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