Aerobic training is endurance training by aerobic exercise. The goal is to get as high as possible cardiovascular performance and lung capacity by prolonged exercises, which end to exhausting rather than muscle soreness implicated by lactic acid. In other words, the goal is to maximize O₂ intake and making the most of it. Marathon runners and other endurance sport competitors do these types of exercises regularly during non-competitive season. In physical exercise, Aerobic exercise is complementary to anaerobic exercise. ... The circulatory system or cardiovascular system is the organ system which circulates blood around the body of most animals. ... The lungs flank the heart and great vessels in the chest cavity. ... (for options, see option exercise) U.S. marine emerges from the water upon completing the swimming portion of the triathlon. ... Lactic acid, also known as milk acid or 2-hydroxypropanoic acid, is a chemical compound that plays a role in several biochemical processes. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless Atomic mass 15. ... This article is about the long-distance race. ...