Abnormal or bad body posture is defined as positioning that deviates from the midrange position of function.
Posture Power: How To Correct Your Body's Alignment
correct and incorrect sitting body postures of little girl
File:STS-57 crew member neutral body postures.png - Wikipedia
Body Postures - Did you know World
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Full article: Evaluation of upper-limb body postures based on the effects of back and shoulder flexion angles on subjective discomfort ratings, heart rates and muscle activities
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Health Correct body postures - EUrêKorpus