It must be a mistake for 'background runner'. See background race (athletics and motor race), runner, background.
John Rene Plaut
BACKGROUND CORREDOR Grammatical error . BACKGROUND CORREDOR is the athlete who runs 1000, 5000 10000, half marathon and marathon. RUNNING TO THE BACKGROUND is driving with the accelerator pedal thoroughly, but CORREDOR TO BACKGROUND is a barbarism.
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