Losing weight is very easy. Losing fat - and keeping it off without losing muscle - is a much bigger challenge.
减轻体重非常容易，减少脂肪——无损肌肉地减少脂肪，是非常大的挑战。
Because you're sitting, you're not exercising, which means you probably will be gaining weight or at least losing muscle tone.
只坐着不运动，你可能在长体重或者失去肌肉弹性。
But astronauts start losing muscle mass within days of entering a zero-gravity environment, and the longer they stay in space, the more their muscles shrink.
航天员在进入零重力环境的几天之内就开始出现肌肉流失。
So, if you like to run, swim or play team sports as well as cycle, don't lose weight by just losing muscle mass, or you'll notice a decline in your performance.
所以，如果你喜欢跑步、游泳、或者其他类似自行车的团队运动项目的话，不要通过减少肌肉来减轻体重，否则你就会发现的你的表现有所下降。
It's possible for your scale weight to remain the same, even as you slim down, especially if you're losing fat and gaining muscle.
有种可能是你的体重没有改变，即使你在减肥，特别是如果你减掉脂肪，获得肌肉。
There are also some if us who want to reach our fitness goals and be in the best physical shape whether it is losing weight or gaining some muscle.
有些人不管是在减肥或者在练肌肉都是想保持健康或是良好的体形。
There are also some if us who want to reach our fitness goals and be in the best physical shape whether it is losing weight or gaining some muscle.
有些人不管是在减肥或者在练肌肉都是想保持健康或是良好的体形。
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