leg work
routine work (that often involves walking)
He was forced to do all of the leg work for the meeting because his assistant was sick.

[TahlilGaran] English Idioms Dictionary ▲

leg work
n., informal The physical end of a project, such as the typing of research reports; the physical investigating of a criminal affair; the carrying of books to and from libraries; etc.
Joe, my research assistant, does a lot of leg work for me.

[TahlilGaran] English Idioms Dictionary ▲