During young adulthood rigidity gradually develops in the te…

During young adulthood rigidity gradually develops in the tendons and muscles of the lungs, chest, and ribs, which leads to a decrease in vital capacity, defined as the maximum amount of air that can be contained in the lungs.   FYI: Regular exercise in young adulthood reduces the risk of a variety of illnesses and diseases in middle adulthood, including diabetes, cardiovascular disease, and several types of cancer.