For those who spend the day at office as well as for those who have a physical work, YOUR MUSCLES NEED YOU.
Stretching should be a daily task. It is wrong to think that stretching is required only by people who exercise.
Some benefits of stretching
Don't underestimate the power of stretching:
Relief from pain
Increase energy levels
Increase flexibility
Better range of motion of the joints
Greater circulation of blood to various parts of the body
Relaxation and stress relief
Enhance muscular coordination
Improve posture
Greater sense of well-being
Improve athletic performance
Decrease risk of injury
Reduce soreness
How to stretch
I recommend this article which explains you exactly the exercise needed for each of your muscles. Take a look here