Your point and click arm . . .
When you clicked the mouse just now, did you feel tension in your arm? Your neck?
Your neck . . .
Turn your head, first to the right, then to the left. Do your shoulders move when your head moves? Does your chin touch your shoulders?
Your arms, shoulders and back . . .
Raise your arms above your head. Does the movement feel stiff? Did you tighten your shoulders . . . did you arch your back?
Next . . .