May 27, 2020 · it is about 80 percent of total capacity, or 4. 8 liters, because some air remains in your lungs after you exhale. forced vital capacity can decrease by about 0. 2 liters per decade, even for healthy people who have never smoked. The four lung capacities are: inspiratory capacity. vital capacity. functional residual capacity. total lung capacity. inspiratory capacity (ic) inspiratory capacity is the volume of air that can be inspired from the end of the tidal expiration or volume of air that can be inspired forcibly after a normal inspiration. Jun 26, 2014 · regular moderately intense activity is great for the lungs, and when you increase your daily activity you get three things done at once: healthy lungs, a healthier heart and a better mood. 6. laughing "laughing is a great exercise to work the abdominal muscles and increase lung capacity," says ryan. Your doctor may want to test your total lung capacity for several reasons: 1. to diagnosis lung diseases and ...