The Pacer Test comes from the FitnessGram fitness assessment used in school physical education classes, where students run back and forth between lines in time with recorded beeps that get progressively faster until they can no longer keep up. Clips of the full test spread online because almost everyone who went through American gym class recognised the voice and the dreaded beeps, and creators began reusing it for parodies, challenges and workout videos. The louder edit keeps that shared memory instantly recognisable even on a phone speaker.