That is why they do not tighten up, even though they participate in supporting substantial weight. A heavy object or weight has a gravitational force directed down the arms, spine, abdomen and legs and this force is counteracted by another force, which is distinctly anti-gravitational.
Al objeto pesado o el peso han dirigido la fuerza de gravitación hacia abajo, a las manos, la columna vertebral, a la cavidad abdominal y los pies y esta fuerza se le opone otra fuerza, que es claramente антигравитационной.