A tangent is a straight line that just touches a curve, so the concept of "running the tangents" is to run the shortest distance possible by running straight from one curve to the next.
切线是一条直线，刚好接触到曲线，所以跑切线是从一个弯道跑到另一个最短的距离。
Topline: From the neck running slightly downwards to the Withers in a harmonious line, then running on straight and level.
背线：自脖颈至肩部，微微向下，线条柔和，向后保持水平直线。
The bottom line is this – if you've been running or sitting for a while, don't get up and go straight for psoas stretching – it might be destabilizing and ineffective.
底线是：如果你跑或坐了一段时间之后不要马上站起来就做腰肌拉伸，有可能会使你的身体失去重心，也是无效的。
The bottom line is this – if you've been running or sitting for a while, don't get up and go straight for psoas stretching – it might be destabilizing and ineffective.
底线是：如果你跑或坐了一段时间之后不要马上站起来就做腰肌拉伸，有可能会使你的身体失去重心，也是无效的。
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