Noun
back straight (plural back straights)
(athletics, horse racing) The straight part of a racetrack, running track, etc., opposite the finishing line; the backstretch.
He got boxed in amongst four African runners in the back straight of the last lap, and was only able to get out into the clear coming into the home straight.
It made me strong.I took a step back, near my whole self in the mirror.I pushed back my shoulders and raised my chin, my back straight as an arrow. Laurie Halse Anderson
It is literally a roundhouse kick performed by turning as if for a back straight kick and executing a roundhouse kick. Source: Internet
Hold your head up and keep your back straight. Source: Internet
Holding a 5-8 pound weight in each hand, bend forward at the hips, keeping your back straight. Source: Internet
Research the basic movements of Tai Chi (back straight, head up, breathing from the diaphragm). Source: Internet
Her jaunty performance, cycling about the Kent countryside, head held high, back straight, and cape fluttering behind her, established the model for portraying that role thereafter. Source: Internet