Success never seems to come but through hard work, often physically demanding work at that.

成功不通过努力工作似乎是无法取得的，而且往往是很耗费体力的工作。

《柯林斯英汉双解大词典》

Actual retirement of many men and women actually occurs at age 62, despite the decline in physically demanding work, and the improvements in health.

实际上许多男性和女性劳动者的退休年龄是62岁，尽管体力劳动已经减少而健康状况已经提升了。

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Physically demanding work was defined as work involving repetitive lifting, load-carrying or other significant physical exertion.

BBC: Heavy work 'bad for childbirth'

In 1960, half of the native-born men in the labor force were high school dropouts happy to do physically demanding, low-skilled work.

CNN: Key to immigration reform: Worker visas

Pregnant women whose job is physically demanding - or who do shift work - could face more childbirth problems, say scientists.

BBC: Heavy work 'bad for childbirth'