1 | All in My Head (Flex)- assistant recording engineer:
- Jason Goldberg
- recording engineer:
- Mike Anderson , Mikkel S. Eriksen, Tito Trujillo and Miles Walker
- additional producer:
- Sir Nolan
- producer:
- Brian "Peoples" Garcia, StarGate and Victoria Monét
- assistant mixer:
- Daniela Rivera
- mixer:
- Phil Tan
- instruments:
- Mikkel S. Eriksen and Tor Hermansen
- guest vocals and guest performer:
- Fetty Wap
- vocals:
- Ally Brooke, Camila Cabello, Dinah Jane, Lauren Jauregui and Normani
- performer:
- Fifth Harmony
- phonographic copyright (℗) by:
- Simco Limited (in 2016)
- recorded at:
- The Hide Out Studios in London , England, United Kingdom, Westlake Recording Studios in West Hollywood, California, United States and Windmark Recording in Virginia Beach, Virginia, United States
- mixed at:
- Callanwolde Fine Arts Center in Atlanta, Georgia, United States
- samples:
- Flex by Mad Cobra
- recording of:
- All in My Head (Flex)
- writer:
- Benjamin Levin , Brian "Peoples" Garcia, Brian Thompson, Ewart Brown, Daystar Peterson, Clifton Dillon, Richard Foulks, Herbert Harris, Leroy Romans , Lowell Dunbar, Julia Michaels, Mikkel S. Eriksen, Nolan Lambroza, Tor Hermansen, Handel Tucker and Willie Maxwell II
| 4 | 3:30 |