The compilation takes its title from the
Minor Threat lyric shouted in the song "12XU", included on the album, originally by the English band
Wire. Dischord assembled
Flex Your Head as a way to record the many punk bands that had started up, and sometimes also ceased, in the previous years in the D.C. area. The album served as either a debut or sophomore release for every band on it except Minor Threat, for whom it was their third. At the time of the album's release not only had most of the bands on it already have broken up, but many had gone on to start other bands, some of those bands also appear on the album.
The Teen Idles had broken up in late 1980 and by the time of the release of
Flex Your Head members had already started
Minor Threat and
Youth Brigade.
The Untouchables broke up in 1981 and with the former members joining a multitude of bands including
The Faith,
The Warmers,
Rites of Spring,
One Last Wish,
Skewbald,
Happy Go Licky, Youth Brigade, and
The Meatmen.
State of Alert had also folded in early 1981 as singer
Henry Garfield had joined
Black Flag. Minor Threat had disbanded (although they would reunite a few months after the album's release) and since then
Ian MacKaye and
Jeff Nelson had founded Skewbald while
Lyle Preslar joined an early version of
Big Black. Youth Brigade and Red C both existed solely during 1981, and both Artificial Peace and Deadline would break up within a few months of the release of
Flex Your Head, aside from Youth Brigade these band's only recorded output is on the compilation, though from those bands would come the longer lasting
Beefeater,
Marginal Man and
Fugazi. Only
Government Issue and
Iron Cross would survive past the next year. The songs "12XU" and "
Steppin' Stone" were extremely popular covers in the D.C. punk scene. "Steppin' Stone", which was performed by State of Alert on this album, was also covered by Minor Threat on their second EP
In My Eyes, while the song "12XU" was so commonly covered that several shows would have multiple bands playing their renditions. ==Recording==