do something standing on your head

do (something) standing on (one's) head

To do something with very little or no difficulty; to complete or accomplish something in a relaxed, carefree, or effortless manner. It took me a little while to get used to this job, but now I could do it standing on my head! You should ask Johnny for help—he does this level of math standing on his head.
See also: head, on, standing
Farlex Dictionary of Idioms.

do something standing on your head

do something very easily.
See also: head, on, something, standing
Farlex Partner Idioms Dictionary

do something standing on your ˈhead

(informal) do something very easily, without any effort: This exam’s no problem. I could do it standing on my head.
See also: head, on, something, standing
Farlex Partner Idioms Dictionary
See also:
  • could (do something) with (one's) eyes shut
  • do (something) standing on (one's) head
  • be able to (do something) in (one's) sleep
  • be able to do something in your sleep
  • able to do (something) with (one's) eyes closed
  • able to do with eyes closed
  • able to do blindfolded
  • able to (do something) blindfolded
  • able to (do something) with (one's) eyes closed
  • blindfold