What do you mean by correct posture? Explain the standing and sitting postures. What are the causes of bad posture?

Correct posture means the balancing of body in accurate and proper manner while sitting ,standing, reading,writing or during any other action of body.
Explanation of sitting and standing posture.
Standing-Heals together, toes apart, body erect. Knee straight, chin inside, chest forward, belly backward, body weight equally on both feet. Sitting-Hips as far back as possible on the chair, legs rest on the floor, thigh horizontal head, spinal column, shoulder and hips should be in straight line and erect.
Causes of bad posture (Explain any two)
i) Improper diet
ii) Heredity
iii) Accident
iv) Disease
v) Obesity
vi) Due to improper exercise
vii) Nature of job
viii) Fatigue
ix) wearing tight clothes
x) Unsuitable furniture
xi) Muscle weakness
xii) unawareness of correct footwear /Improper footwear.