Bending of the back is usually caused by personal habits, but it is not really bending. I like to look down at my mobile phone and walk hunched, which is a bad habit. The general corrector or mold you are talking about must be forced to change your bad habits through traction and binding.
For the flat belly, there is indeed that kind of magic belt or trousers, which makes it look flat by pressing it tightly, but after taking it off, there is still something in the swimming ring. Unless it has a magnet, massage stimulates your fat muscles and so on from the moment you put it on, which plays a role in sitting and losing weight. However, such products are slow to take effect and are ineffective to some extent.
To sum up, if the price of this thing is moderate, you can buy it back and try it. If it is expensive, please look at the homonym of these two words: cheat ghosts. Deal with it as appropriate.
The best way to hump is a good back and simple violence. As for the stomach, it is still healthy from running. If it is caused by constipation, you can try Daikin black garlic, moisten intestines and detoxify, and cooperate with running to become healthy and healthy.