Long Tones and Train Rhythms:
The two main-stay basic exercises to bring lungs out of their comfort zone and strengthen breathing muscles.

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1) LONG TONES:
(The basic exercise to work your lungs out of the comfort zone to improve and maintain maximal inspiration and maximal expiration.) 

At this point try to draw even further - this may cause slight discomfort.
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Next gradually exhale and breathe in and out for possibly half a minute in a comfortable fashion.

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TRAIN RHYTHMS:

Start slowly and increase as tolerated; a slight discomfort in the chest muscles is normal and expected.