For example, as a fitness instructor, I have suggested that many stevedores should keep their lower back upright when moving things, and squat down to move them instead of bending down, so as to better protect their lower back, like this:

They will all express their gratitude and say that it is really not that stressful to move around like this. And after a while, it returned to the state of bending over to move things. Then they will tell me with a shy smile that bending down is faster and there is no way.

Therefore, manual workers, various joint injuries or long-term patients are very common. This is because the pursuit of work is efficiency, rather than rational use of one's body-which runs counter to sports training. Capitalists give you money, but you don't have time to think about anatomy, strength, center of gravity and balance.