My father ordered us to stand in a straight line.

父亲命令我们站成一条直线。

youdao

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。

youdao

Instead officers say they're still checking drivers by getting them to do things like stand on one leg and walk in a straight line.

BBC: Newsbeat - Health - Drug-driving tests not ready