Though 'legwork' sounds like physical walking, it often refers to doing background tasks or research. I've done the legwork to find the best price for our vacation.
Pro Tip 2/3
Effort Intensive
'Legwork' suggests tasks that require significant time and effort, but not necessarily complexity. Finding all the addresses for the invitations required a lot of legwork.
Pro Tip 3/3
Task Preparation
The word 'legwork' can mean doing preparatory tasks to set up success for a larger project. She did all the legwork before the team meeting, making the discussion much easier.