So when cleansing or meditating people usually imagine their negativity as black fog right? then it slowly disappears as they keep mediating.

Even though we don't see this thing actually in real life, happening in front of our eyes, it still works.

I was thinking we could do something similar for our body.

For example you could be listening to a waist slimming subliminal. Close your eyes get all comfy and lay down. Imagine your waist in an exaggerated/normal size then slowly as the subliminal continues imagine it slowly shrink to your desired/exaggeratedly small size. You can obviously use it for anything.

Let me know if it works!