Swimming helps us to strengthen  our hips & leg muscles.It is beneficial  to people with arthritis & for patients  who have been advised by physiotherapy . Still,workout in the pool on a hot summer day is preferable to a jog or a walk.This builds up the leg muscles besides it has a several aerobic benefits for the heart.
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Swimming is an individual or team sport and activity. Competitive swimming is one of the most popular Olympic sports, with events in freestyle, backstroke, breaststroke, and butterfly. In addition to these individual events, Olympic swimmers also participate in relays.

In competitive swimming, four major styles have been established. These have been relatively stable over the last 30–40 years with minor improvements. They are:

Butterfly (fly)
Backstroke (back)
Breaststroke (breast)
Freestyle (free)