Often pregnant women in their third trimester experience difficulty breathing because the baby is taking up more space.  Here is a nice yoga stretch you can do to “lengthen your waist” and bring your breath fully into your body.  In a comfortable seated position (you may sit on the ground or on a chair with no arm handles) inhale your right arm straight up overhead, exhale exten your right arm over your head, while reaching your fingertips as far as they will go (i.e., imagine someone gently pulling your fingertips).  Hold and breathe in thru your nose and our through your nose for two complete breaths.  Repeat on the other side.  Repeat the breath with the movement up to 10 times on each side, or for as long as you feel comfortable.