YFSLabs R&D have spent several years on various dictums. Current results are as follows. Stop clenching your teeth. Don’t hunch your shoulders. Relax into it. There is no good reason to clench your teeth. You know you do. Suppose you are opening a new jar of pickles and it is not cooperating. You clench your teeth as though it will help your upper body strength. It’s like sticking out your tongue a little. There are only two decent reasons to hunch your shoulders. If you are launching into a physical combat with an opponent you may want to become a smaller target. If you are walking into a stormy headwind the same is true. Other than that hunching your shoulders is an avoidance behavior that harms your stature. There’s an old politically incorrect line in many cultures that amounts to, if rape is inevitable lie back and enjoy it. The inevitability of stuff happening is a sword that cuts two ways. Bad stuff happens. Good stuff happens. Relax into it. Any moment now things will turn again.