I really need to lose some weight.
我真的需要减肥了。
Why don't you attend an aerobic class?
你为什么不去参加一个有氧健身班呢?
It might be a good idea to join a fitness center.
您可以参加健身俱乐部。
You need to work out.
你需要去锻炼一下。
I exercise every morning by jogging.
我每天早上做慢跑运动。
I go to the gym a lot.
我常去健身房。