Because it is possible to train incredibly hard without fear of injury, some swimmers do. In so doing, they throw down the gauntlet and raise the bar, inviting others to train hard in order to compete. As a result of repeatedly meeting these rare physical challenges, enormous adaptation takes place. Phenomenal cardiopulmonary systems are produced. Muscle strength is vastly increased.
Swimming is the best exercise one can get.
It is the ultimate fitness activity. Competitive swimming engenders fitness, power, stamina, flexibility, and robust health. Swimming produces the best-looking, healthiest bodies in the world. Competitive swimming truly does the body good. A swimmer cannot cheat and win.