As easy as falling off a log
Meaning
Extremely easy to do.
Usage
Used when describing simple tasks.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Falling from a log happens effortlessly.
Used in American slang since the 19th century.