I love swimming.  It's great exercise.
I do too!  Do you often swim for exercise?
only slightly less dense than water, water supports the weight of the body during swimming. As a result, swimming is “low-impact” compared to land activities such as running. The density and viscosity of water also create resistance for objects moving through the water. Swimming strokes use this resistance to create propulsion, but this same resistance also generates drag on the body.
Hydrodynamics is important to stroke technique for swimming faster, and swimmers who want to swim faster or exhaust less try to reduce the drag of the
New York Athletic Club. In 1962, Nurmi predicted that welfare countries would start to struggle in the distance events: "The higher the standard of living in a country, the weaker the results often are in the events which call for work and trouble. I would like to warn this new generation: 'Do not let this comfortable life make you lazy. Do not let the new means of transport kill your instinct for physical exercise. Too many young people get used to driving in a car even for small distances.