The pop rock song was written by Platten and Dave Bassett, and produced by Jon Levine.

In the United States, the song reached number six on the Billboard Hot 100 and was certified 6× Platinum by the Recording Industry Association of America.

James Lees directed the music video for "Fight Song", which features Platten wandering around a city and performing at a bar.

In further promotion, Platten performed the song at award shows, sporting events, and as guest on Taylor Swift's tour.

A review by Markos Papatados from the Digital Journal stated "The lyrics for 'Fight Song' are captivating and they tug at the heartstrings.

Platten's vocals are crisp and impressive, where the listener can recall such songstresses as Taylor Swift and Tristan Prettyman.

[8] It has also reached quadruple platinum sales in the US, selling over 2 million copies in Platten's home country.

[16] On July 12, 2016, Platten performed "Fight Song" at the 2016 Major League Baseball All-Star Game at Petco Park in San Diego, where baseball fans and players held up cards with the names of people they knew were battling cancer to dedicate the performance to them.

[18] On January 13, 2025, Platten performed the song prior to a televised NFC Wild Card game between the Los Angeles Rams and the Minnesota Vikings.

The song was performed as a tribute to the citizens of Los Angeles as they deal with the wildfires that ravaged the area just a week prior.

[20] It was frequently used at rallies and speeches, with some media commentators labeling the song as synonymous with Clinton's eventual loss in the election.