In general, warm up by focusing first on large muscle groups, such as your hamstrings.
通常，热身首先注重在在大的肌肉群，例如你的大腿。
Swimming is great exercise because it USES both large muscle groups (arms and legs).
游泳是极好的运动，因为游泳同时运用到了胳膊和腿的大肌肉群。
The movement of large muscle groups will help to stimulate bone growth and strengthening.
而大肌肉群的运动有助于刺激骨骼的生长和强化。
The movement of large muscle groups will help to stimulate bone growth and strengthening.
而大肌肉群的运动有助于刺激骨骼的生长和强化。
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