you are crouched down hands ready to return the serve
It means "move to the ready position".
It means to "take a stand". Be ready to defend your position.
I'd be inclined to think that you've either mistaken a ready position for something else, or else have fallen into a snipe hunt. The ready position is a tactical carry position - there are no steps to it, as it is not part of drill, and there's a few different ready positions, the most common being a ready carry for patrol, then you have your high and low ready positions for high alert situations.
to get ready, or be ready ;)
The "ready position" is the stance which a tennis player uses to prepare him/herself to hit the tennis ball. For further information, refer to the "BBC Sport" link, below.
It is important for a player to be in the ready position because it allows the player to move quickly and get into proper position to return the birdie.
It basically means you are ready for anything that comes at you.
do you mean I ready
A management position is usually a career advancement. Moving into a management position shows that you are ready for a greater challenge.
This means that a person is not attached to someone in reference to marriage or a significant other. Since this person is non-committed to another or "single", they are in a position to be able to date freely. "Ready to mingle" means they are ready to date people once again without the strings of a significant other.
If by "do it" you mean have sex, if you don't want to, don't. You aren't ready. When you're ready, you'll want to have have sex. Don't ever put yourself in the position of having sex when you don't want it. You will feel incredibly cheap.
As a question: Is it ready? or Are You Ready? As a statement It/he is ready.