shoulders back and relaxed
both your shoulder line and hip line remain parallel to the ground beneath them; 2) your torso is back, upright, shoulders back and relaxed; 3) your hips are thrust, or tucked under, in a forward position, tailbone pointing down.
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shoulders back and relaxed
肩膀向后，放松
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Keep your shoulders back and relaxed.
保持双肩向后并放松。
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Look ahead (not down), keep your shoulders relaxed, arms swinging back and forth (not side to side), and your hands gently clenched.
向前看(不是向下)，保持你的肩膀放松，手臂前后摆动(不要左右摆动)，手轻轻握紧。
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