You must change the amount of time you spend negatively perceiving,analyzing, and/or judging your physical body.
The video is one way to do this.
For people who are really stuck in their heads using these breathing exercises to replace negative thoughts, even if just for a minute or two, will give you a break to build on.
For people who are for the most part good. The breathing exercises with sharpen the thoughts, clear the mind, and may even create, maintain, sustain, a little definition to the rectus abdominis (the ab muscles that go up and down your front)and the obliques (the ones on the sides)
For those of us in the middle, spending time in a relaxed state, even two minutes, is never a bad thing.