From my earliest school days, I had to sit up straight on old wooden benches, and the teachers made us keep our hands behind our backs on the theory that it would improve our posture. We had to raise our hands up very straight and high when we had something to say, and we were supposed to raise only our index and middle fingers. Sometimes I would lean back and keep my arm up all the time because I usually knew the answers. Maybe that built up muscles for my serve!
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