Because this kind of exercise stimulates the pituitary gland to secrete more growth hormone to promote growth (principle: when standing upside down, blood gathers in the brain, and the pituitary gland has sufficient blood supply and its function is enhanced).
In the same way, hanging upside down will open the intervertebral space and make the body taller, which is equivalent to doing traditional Chinese medicine traction physiotherapy.
Hanging upside down can also make facial skin better and better.
But don't go to extremes in everything, and don't hang upside down more than 1 hour every day. The key is persistence. Hanging upside down for a long time will lead to long-term congestion in the brain, and it is easy to have headaches when you are old.
Older people should never do it. People with cardiovascular and cerebrovascular diseases and hypertension can't do this exercise.