What causes back pain and stress?

Explanation:

At the point when you're focused on, your breathing examples change and cause strain and pressure in the mid-back. Your shoulders hunch up and cause torment all through the upper and center back. Low-back torment incorporates the tailbone and lower half of the back muscles. These muscles influence adaptability and posture.

this is not an education question

answer; i believe that the correct answer is (b) is a factor associated with physical activity and heart disease;