Which muscles need to be stretched to prevent swayback posture and backache? a. chest muscles b. calf muscles c. shoulder muscles d. front of hip joint

The correct answer would be D, Front of Hip Joint.

Explanation:

Swayback posture is the posture in which the pelvis is shifted forward. This results in the Hip Extension, and the thorax is shifted backwards. So backache is likely to occur. In order to avoid or prevent this posture and backache, front of the hip joint should be stretched to relief the pain. By stretching the front joint of the hip, the lower back muscles will come in action and sooth the effect of back pain and prevent swayback posture.