This is a way to breathe by letting go. I also call it: nothing breathing
It is said in breathing meditation that you don't have to worry about the in breath—because the in breath happens by itself. Once you breathe all the way out, nothing is required of you to breathe in. It happens naturally
All is left is to breathe out
And even breathing out you do not have to think about—because (if you let every effort go) you will automatically breathe out as far as you need to
So
Breathing is all letting go
Because nothing is required of you in order to continue breathing
What happens is: you let go of all effort. You notice that you are breathing. And you notice that nothing is required of you in order to do so
And
Noticing yourself breathing is something for you to do
As you're doing nothing else
Now that you've let go