Co-produced by French DJ/producer David Guetta, the song heavily samples from Rob Base and DJ E-Z Rock's "It Takes Two", making use of the line "I wanna rock right now" multiple times, as well as the drum break, and part of the "Yeah!

Fraser McAlpine of the BBC Chart Blog gave "Rock That Body" three out of five stars and called it "a party banger".

[8] Alex Fletcher of Digital Spy gave the song a positive review stating: "It's got plenty of pounding beats, synths that sound like they've been filled with Red Bull and more twisted vocal effects than an mp3 of Akon cutting loose in a vocoder factory.

On the US Billboard Hot 100, the song peaked at number nine, making it their fifth consecutive top ten hit.

[10] For airplay, it proved to be their lowest-charting song since non-single "Gone Going" from their fourth studio album Monkey Business (2005), released to radio stations in early 2006.

The "Imma Be Rocking That Body" video closes with a scene which reveals the entire story to be Fergie's dream as the other members find her barely conscious following her motorcycle accident in the introduction.