What variables affect lung capacity?
Vital capacity is a term which refers to the maximum volume
someone can breathe in his lungs [ the max volume of air inhaled
after a max exhalation]. It depends on many factors. How fit
someone is, smoking, obesity, height, sex, body size and the
posture of the body [when someone lies his vital capacity is less
than standing].
Also when playing a flute instrument you'll increase your vital
capacity,