4. Posture
Most people have been told that posture is important. What many people do not realize is that while good posture is good for the back and other muscles of the body, good posture also goes a long way when it comes to your lungs.
Remember, your lungs are only going to be able to expand to the amount of room that is made for them. If you are sitting all day and you are hunched over, your lungs are not going to be working at their full capacity. One simple trick that you can do in order to provide your lungs with more room is to sit in a stable chair and lean back slightly.
When you are in this position, lift the chest up and then open up the front part of your body as you take several deep breaths. This will help the lungs expand to their full capacity.