我们要说的是身体的健康程度决定了最舒适的步行速度。
We are saying your body selects a walking speed that is best for you based on the health of all your body systems.
在舒适的步行速度提高了效率，心肺系统的刺激肺及心脏，但更逐步率比大多数其他形式的活动。
Walking at comfortable speed improves the efficiency of the cardiorespiratory system by stimulating the lungs and heart, but at a more gradual rate than most other forms of exercise.
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