straight back

listen to the pronunciation of straight back
Английский Язык - Турецкий язык
düz geri
Английский Язык - Английский Язык
good and erect posture
back straight
The straight part of a running track (or similar) opposite the finishing line

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.