This Benny Blanco, Ammo, JMike and Billboard produced slow-building dance track is about a hot boy that Britney is flirting with.
The song features a rapped bit by singer/actress turned rapper Sabi. Spears told Rolling Stone that she loves, "to find new artists that very few people know about." She added: "It's one of my favorite things to do because it's like being part of a secret. Friends and people around me are always showing me new artists that they love and that's how I learned about Sabi and ended up working with her on '(Drop Dead) Beautiful.' I have always wanted to feature a new artist on one of my albums and she is really cool."
Though Sabi wasn't in the studio at the same time as Spears, she felt Britney's presence when she was dropping her verse. "She recorded it already and then I went in. I rapped on it and I'm a singer. I rap when I feel the mood is right, so it all worked out. When I'm inspired to rap, I rap, but I'm a singer," she explained to MTV News. "Me and Benny Blanco, we were just sitting there throwing ideas back and forth."
"Kickstart My Heart" is about all the ways Motley Crue gets their blood flowing without drugs. It was inspired by their bass player Nikki Sixx, who claimed he had to be revived with a shot of adrenaline to the heart after an overdose.