Swimming is the method, activity or sport of propelling oneself through water using the limbs. Swimming is a popular recreational activity, particularly in hot countries and in areas with natural watercourses. Swimming is also a competitive sport. There are many health benefits of swimming, yet basic swimming skills and safety precautions are needed to participate in water activities.
The basic principle of swimming is buoyancy. The human body has a high water content and its density is close to the density of water. Due to its cavities (most prominently the lungs), the average density of the human body is lower than that of water, so it naturally floats. Swimming is governed by the Fédération Internationale de Natation Amateur (FINA).
The human body, being composed mostly of water, has nearly the same density as water. Thus, staying afloat requires only a slight propelling of water downward relative to the body, and transverse motion only a slight propelling of water in a direction opposite to the direction of motion, due to generally low hydrodynamic drag. This propelling is typically accomplished by cupping the hands and using them as paddles, and by kicking the legs to push water away from the body.
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