Keep back straight and bend knees.
背要直，只弯两膝。
Keep your upper back and neck comfortably straight.
保持后背上部和颈部舒适挺直。
Keep your back straight. Thighs tight and shoes right.
保持你的腰背挺直，大腿绷紧和鞋子穿对。
You should keep your back straight.
你应该把后背挺直。
Keep your head upright, shoulders horizontal, chest broad, back straight.
头容正，肩容平，胸容宽，背容直。
Bent your knees, but keep your back straight.
屈膝，保持背部挺直。
The most effective way to walk is the natural way. Keep your head high and your back straight .
自然地行走是最有效的步行，要保持抬头挺胸的姿式。
The most effective way to walk is the natural way. Keep your head high and your back straight .
自然地行走是最有效的步行，要保持抬头挺胸的姿式。
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