When sitting on a chair why can't we keep our back straight for to long?

Raji (last edited 4 years ago) (Expert, Founder @Qalaxia, City Commissioner)

Good posture involves training your body to stand, walk, sit and lie in positions where the least strain is placed on supporting muscles and ligaments during movement or weight-bearing activities. The article provides illustrations and instructions for correct lifting, driving, sitting, and sleeping positions.

https://my.clevelandclinic.org/health/articles/4485-back-health--posture