What is it?

"Sit up straight!" "Stand up straight" "Pull your shoulders back!"
We all heard it as kids, and those were basic of our good posture.
Definition for posture can be: posture is a habit that is developed by repeating movements and patterns over time and in the majority of instances.
Maintaining good or bad posture is not something that is thought of, but it can be improved with many different techniques.
Good posture allows the body to function at its best, but "bad" posture can cause stiff necks, shoulders hunched forward or pulled tightly back, restricted breathing, tightness in the legs, backaches, headaches, and other painful symptoms.