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Improving my time with "energy-saving running" Until I was in my second year of university, I thought of the 100m as a race where you sprinted from start to finish. Because I would run as hard as I could when the "starting gun" sounded, I would get tired after 60m and my legs would stop moving, so my time didn't improve. In an attempt to master a more efficient way of running, I worked on "energy-saving running". When accelerating, I was conscious of shifting my center of gravity and didn't use force. I eliminated energy waste and minimized the slowdown in the second half. By practicing this running method, I was able to improve my 100m time to 10.25 seconds in my third year.