Doctors are more focused on treating diseases, and scientists are more focused on making more sophisticated medical devices.
If simple ways to enhance human fitness are invented, then doctors and related systems are basically out of a job, to the detriment of their interests.
Bodies are all stronger and free from disease. Then the rich have less of a sense of superiority and everyone lives longer without getting sick....
Hey,, honestly, exercise is just that 、、、、
Basically the above is the truth, there is no profit motive.