The change rules of maximum force, stretching time, maximum height of centre of gravity, etc. in SJ are discussed respectively.

着重讨论了最大力值，蹬伸时间，重心腾空高度等主要生物力学指标的变化规律。

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If you feel any muscle tightness while you're warming up, stop jogging for a moment and stretch out the tight area (but don't count this stretching time as part of your 10-minute minimum).

如果热身时候感到任何肌肉紧张，停止慢跑，拉伸一下紧张的部位(但是不要把拉伸时间算到你的10分钟里面去)。

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Working out in the afternoon also requires a little less time stretching on the mat because your heart and muscles are more prepared for the stress of exercise than when you're fresh out of bed, Bryant says.

FORBES: Best Time To Hit The Gym

The Earth is warmer now than during 70 to 80 percent of the time stretching back to the last Ice Age, according to researchers from Oregon State and Harvard universities who studied data from more than 73 global sites.

FORBES: What Excellent News: Earth Warmer Than in Most of the Past 11,300 Years

Consistently compressing the body on one side or stretching another side over time can create an imbalance and result in soreness or pain in that area or exacerbate an existing condition.

WSJ: Find the Perfect Sleep Position