Swimming is movement through water using one's limbs, and usually without artificial apparatus.
The most common purposes for swimming are recreation, exercise, and athletic training.
Recreational swimming is a good way to relax, while enjoying a full-body workout.
Swimming is an excellent form of exercise. Because the density of the human body is
very similar to that of water, the water supports the body and less stress is therefore
placed on joints and bones. Swimming is frequently used as an exercise in rehabilitation
after injuries or for those with disabilities. Swimming is primarily an aerobic exercise
due to the long exercise time, requiring a constant oxygen supply to the muscles,
except for short sprints where the muscles work anaerobically. As with most aerobic
exercise, swimming is believed to reduce the harmful effects of stress. Swimming can
improve posture and develop a strong lean physique.