He's working at losing weight.

　　他正在努力減肥。

　　I'm very conscious of my weight.

　　我很在意自己的體重。

　　He was weight training like mad.

　　他在瘋了似地進行舉重訓練。

　　I have lost a lot of weight.

　　我體重減輕了不少。

　　I've gained weight recently.

　　最近我的體重增加了。