What subject do you worry about most at school? Many students worry about math. Some students can't sleep well the day before a math exam. Others may feel very worried during the exam itself. But there might be a way to make the subject less stressful(有压力的).
"For people who worry about math, posture（姿势）makes a big difference," Erik Peper from
San Francisco State University told the Daily Mail. That's right - sitting up straight(直地) can help you do better in math exams.
Scientists tested 125 college students. They asked them to do a math test while sitting up straight, or sitting in a slumped-over (趴倒的) position. After the test, 56 percent of the students said the exam was easier to do if they were sitting up straight.
Students who were not worried about taking the math exam did not do better from better posture. But they did find that it was more difficult to do math while slumping over, Science Daily reported
Good posture isn't just helpful for taking math exams. Runners, musicians and public speakers can all benefit from better posture. When you feel stressed out, you can also try to sit up straight or stand tall. It can help you feel more positive and focus better.
B . 
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D . 
