If you want to improve your lung capacity, take a deep breath that fills up your chest, your lower back, and your intercostals. Then, as slowly as you can, release the breath with a hissing sound. You can even time yourself, so if you do it and you can hiss for 40 seconds, you might try it again and try to extend it to 45 seconds, then 50. That will help strengthen your lungs and your support system.