his knees
Examples
A plowman on his legs is higher than a gentleman on his knees.
He who hopes for spring with upturned eye never sees so small a thing as Draba. He who despairs of spring with downcast eye steps on it, unknowing. He who searches for spring with his knees in the mud finds it, in abundance.
When a batter swings and I see his knees move, I can tell just what his weaknesses are then I just put the ball where I know he can't hit it.
For a drunkard the sea only reaches his knees.
An upstanding peasant is bigger than a nobleman on his knees.
A farmer on his knees is higher than a gentleman on his legs.