I like swimming

Of all sports, swimming is the one I like best for the following reasons. On the other hand, iIt is an integral part of all water sports. By "swimming" I mean (better: Swimming is) the sport in which players perform the act of moving through the water by using the arms, legs, and body in motion (or: using the arms, legs, and body to move through the water). Thus, iIt helps me to have a beautiful body. On the other hand, Swimming is a cheap way to keep my health good me healthy, because I don't have to spend much money buying equipments, only a suit is enough for me to do it (better: a swimsuit is all I need). In addition, I can find somewhere to swim easily such as a pool, a lake, or a river because the place where I live has all those. To sum up, Different people like different sports, and for me, swimming is the best choice.

I like swimming

Of all sports, swimming is the one I like best for the following reasons. On the other hand, it is an integral part of all water sports. By swimming, I mean the sport in which players perform the act of moving through the water by using the arm, legs, and body in motion. Thus, it helps me to have a beautiful body, On the other hand, swimming is a cheap way to keep my health good, I don't have to spend much money buying equipments, only a suit is enough for me to do it. In addition, I can find somewhere to swim easily such as a pool, a lake, or a river because the place where I live has all those. To sum up, different people like different sports, for me, swimming is the best choice.

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Impressive! The grammar and vocabulary are nearly perfect. Your sentences would sound a little more natural without the unnecessary introductory phrases like "on the other hand" and "to sum up."