I think I am going to start swimming for exercise. I used to really enjoy it when I was younger.
That's a good idea. Since swimming is the self-propulsion of someone through water, it burns a lot of calories.
That's good to know because I need to burn A LOT of calories. I need something more low impact for my knees too.
The elliptical trainer is also good for low impact. It doesn't cause excessive pressure on the joints.
That's a good idea.  I wonder what swimming stroke would be the best for exercise.
Swimming stroke
Human swimming typically consists of repeating a specific body motion or swimming stroke to propel that body forward. There are many kinds of strokes, each defining a different swimming style or crawl.
In high school, collegiate, and Olympic swimming, there are two undulating strokes (breaststroke, and butterfly stroke,) and two alternating strokes (front crawl and backstroke).
Most strokes involve rhythmic and coordinated movements of all major body parts — torso, arms, legs, hands, feet, and head.
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