没有为什么,这是英语的习惯用法.单从语法上来讲用ourselfs也没错.
反身代词的用法中有这么一条：
4） 在不强调的情况下,but,except,for 等介词后宾语用反身代词或人称代词宾格均可.如：
No one but myself (me) is hurt.
与此情况类似
So all of us run for half an hour every day to build us up.
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