... Look downward=向下看 keep your knees straight=伸直膝盖 Supine=仰卧 ...
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keep your knees straight
保持膝盖挺直
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Bent your knees, but keep your back straight.
屈膝，保持背部挺直。
youdao
Set your feet shoulder-width apart, and keep your knees slightly bent, back straight, and eyes focused straight ahead.
双脚与肩同宽，保持膝部稍弯，后背挺直，双眼注视前方。
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