legwork

[ leg-wurk ]
/ ˈlɛgˌwɜrk /

noun

work or research involving extensive walking or traveling about, usually away from one's office, as in gathering data for a book, a legal action, etc.
action of the legs as executed by an athlete, dancer, etc.

Origin of legwork

An Americanism dating back to 1890–95; leg + work

British Dictionary definitions for leg work

legwork
/ (ˈlɛɡˌwɜːk) /

noun

informal work that involves travelling on foot or as if on foot