 You won't black out, but you'll start to feel a little hazy. So what you do is you breathe in for 10 slowly, like 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 is the length of the first in-breath. Then when your breath is in, you push that breath down into the lower part of your rib cage, into your abdomen for the count of 10.