Stand side-on to a bench with your closest hand and knee on the bench, back parallel to the floor (neck in line) and a dumbbell in your other hand, arm hanging straight down.

侧立于练习凳一侧，靠凳一侧的手与膝支撑于凳。背部与地面平行(与颈部成一条直线)，另一侧手手持哑铃，手臂垂直悬于体侧。

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With your leg stretched out in front of you and the knee supported, make an imaginary line from the heel to the ground.

将你的腿前向伸展，膝盖绷紧，作一条从脚后跟到地面的垂线。

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Similarly, for the curtain call, when actors bow or curtsy, they place one foot behind the other and bend at the knee, thus 'breaking' the line of the leg.

类似的，当谢幕的时候，演员鞠躬或者行屈膝礼，他们将一只脚放在另一只的后面，弯曲膝盖，这样“切断”了腿的那条直线。

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They are super important in a sport like running, where improper foot and knee alignment can mean the difference between smiling at the finish line of a marathon and heading into the ER for knee surgery.

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Also consider the flared trumpet-skirt silhouette, which is sassier than an A-line and falls between your lower knee and mid-calf.

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Jagielka's return to the Everton starting line-up after a serious knee had coincided with a six-game unbeaten run, and his side, fresh from 10 days' rest, looked the form team in the opening exchanges.

BBC: Aston Villa 2-2 Everton