I'm tired because of "gravity", not the amount of work or commuting time
Have you ever heard the story that "going to space will cure stiff shoulders"?
This is a story told by astronaut Norishige Kanai in an interview, but in outer space where there is no influence of gravity, there is no need to support the heaviest head in the human body, so there is no stiff shoulder. It seems to.
For about 30 years, I have observed and recorded human movements, verified "correct movements that match the human body structure" along with kinematics, anatomy, physics, etc., and returned them to the world of sports. I have supported the players as an expert in the field of Iku motion analysis.
What we have learned in that research is that the main cause of human fatigue is the gravity of the earth.
Humans resist the gravity of the earth with only two legs. Unlike many creatures straddling on four legs to disperse the enormous force of gravity, humans receive gravity in an unstable state with only two legs. That is why it is necessary to continue to take a stance of reducing the area subject to gravity as much as possible.
However, when I was a kid, I received wrong posture guidance such as "Put your chest!" You start to feel tired when you start to feel tired.
This time, I will tell you how to stand without getting tired from my book "The Body Encyclopedia without Tiredness".
Be careful and "stretch your chest!" Is a ridiculous mistake
Have you ever been instructed to "be proud!" If you weren't doing well when you were given the command "Be careful!" During physical education? I think that many people think that the experience they were taught at this time will remain in their memory even after they grow up, and that the correct way to stand is to "stand up with your chest."
But this is a big mistake.
"Correct standing" is a posture in which the area of the body when viewed from directly above is made as small as possible. Have you ever seen a foreigner standing with a large jar or luggage on his head? That way of standing can be said to be the "correct way of standing" that makes sense structurally in the human body.