 " Fighter " received mostly positive reviews from music critics , who praised Aguilera 's vocals and the song 's empowering lyrics . The single peaked at number 20 on the US Billboard Hot 100 and was certified gold by the Recording Industry Association of America ( RIAA ) . As of September 2014 , " Fighter " has sold 1 @.@ 184 million copies in the United States . Elsewhere , the song reached the top ten of several national music charts , including those in the United Kingdom , Canada , Australia , and the Netherlands . 
