Is Chest expnasion of 5cm (currently 3cm while inhalation) while inhalation possible by deep breathing exercises using lung exerciser in 1-2 months?

Chest expansion. Hello ~ your question as written is difficult to understand but if I do, you are asking if your lungs vital capacity will improve with deep breathing and lung exerciser. Yes it will but to a max predetermined by your body size When the chest gets bigger for body builders that is muscle on the outside and not much increase in lung volumes. If that does not answer resubmit question thx.