He's working at losing weight.

他正在努力减肥。

《牛津词典》

Some applaud the policy as fair, because it rewards both the individuals who maintain a healthy weight and those who are working towards achieving it.

一些人称赞这项政策是公平的，因为它既奖励了那些保持健康体重的人，也奖励了那些正在努力实现健康体重的人。

youdao

Repeated ministerial advice is carrying little weight and the expansion programme is not working very well.

部长们一再提出的建议收效甚微，扩张计划也不太奏效。

youdao

President Kagame is working to find a balance between the pull of the future and the weight of the past.

VOA: standard.2009.04.08

Khan also believes working alongside four-weight world champion Pacquiao, who is currently preparing to face De la Hoya, will help his development.

BBC: Khan seeks redemption with Roach

So now Jordan rides the bus home after school ends every day, no running around at practice or working out in the weight room with the rest of his buddies.

FORBES: I Will Gladly Pay More Taxes to Expand High School Sports

In the blog post, Wessel also pulls together apps for Google's Chrome browser and Android mobile operating system designed to help with popular resolutions like losing weight, working out more, getting your finances in order and taking up new hobbies.

CNN: Losing New Year's resolve? Google wants to help