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Unit 108：Get into the swim
第108單元：游泳去
One of the best all-around exercises,swimming increases both cardiovascular and muscle strength.
游泳能促進心血管及肌肉的耐力，是最佳的全身運動之一。
There is hardly any stress on your body's joints,because water turns you into a kind of weightless underwater astronaut,
游泳時你全身的關節(jié)幾乎沒有任何的壓力，因為水使你變得好像是一個處于無重力狀態(tài)的水底航天員，
making your every movement an easy,flowing one.
使你的每個動作輕松又流暢。
But water also offers resistance that helps you build muscle strength and tone.
但水提供的阻力也會幫助你強化肌肉使其結實有力。
Doing laps in a pool-no matter what the stroke-is excellent exercise.
不管你用什么姿勢游泳，在泳池里來來回回的游都是絕佳的運動。
You can also "take a walk"underwater or perform calisthennics like leg lifts or arm circles.
你也可以在水底“散步”或做抬腿或轉手臂的體操。
Research shows that water actually offers an equal aerobic workout in less time than one on dry land.
研究顯示，在水里做有氧運動能以較少時間達到在陸上做的同稱效果。
A half-hour of walking in water equals the energy output of a two-hour walk in the woods,one study showed.
某研究顯示，在水里走上半小時和在樹林里走上兩小時所消耗的能量相同。
Make sure you're about chest deep(to benefit from the resistance)and simply go for a stroll.
確定水深要及胸(這是為了從水的阻力中獲得對身體的好處)然后就開始水中散步吧。
