This creates a poisonous mental dialogue. I know we don't say this stuff out loud, we are saying it silently in our minds and that's okay, right? No one can hear that? Actually yes - someone IS listening to that stream of destructive smack talk in our heads. We are. Our body is listening, and hearing every pejorative word we think.
And it does exactly what we would do if we had, say, a personal trainer who attempted to motivate us by shouting at us, "You are so fat why are you even bothering? Nothing you do makes a difference. You are old and your ass looks massive." Would that make you want to go work out? Eat well? No.
What do you expect from a personal trainer? "Attaa-girl. You are doing so well. You've gotta start somewhere baby, you are doing GREAT!" That would make you want to work out!
Think of it another way. Would you talk to your beloved pet, or treasured child in the way you talk to your body? "Fido/Bella, you are ugly, fat and useless. I hate you for being the way you are." Not nice right?
Remember that the most important person who influences how your body responds is listening when you talk smack in your head about it. And that's you.
Keep your self-talk loving, gentle and encouraging. Keep it light, positive and compassionate. Talk to yourself like you would a treasured child or pet.
You might just be amazed at how you respond when the comparisonitus of judgey, self-hating body talk is exchanged for a stream of encouraging, loving positivity. You body might well just surprise you, too.