Stretching your back before a test may u avoid

The answer would be Muscle Stiffness.

Explanation:

When you are going to give an exam or test, you are suppose to sit for long hours with your back bent, writing your test. Sitting in the same posture for long would make the muscles stiff. So if you do some stretches before going to give the test, then your muscles will be relaxed, and there will be less stiffness in your back bones and muscles. So if you want to be relaxed physically during the exam, do some stretches before going for exam.

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