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Discover LudwigThe phrase "keep your back straight" is correct and usable in written English.
You can use this phrase when you are giving instructions or advice to someone regarding posture. For example, you might write, "Make sure to keep your back straight when performing the exercise."
Exact(60)
Keep your back straight.
Keep your back straight, not arched.
Keep your back straight and upper body still.
Pull in your abdominals and keep your back straight.
Always keep your back straight!
Be sure to keep your back straight.
Keep your back straight while moving forward.
Always keep your back straight when squatting.
Keep your back straight when sitting.
Keep your back straight at all times.
Try to keep your back straight.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com