Swimming is a competitive sport played around the world and on many different levels, including the Olympics. It's also an easy sport to do on your own， both for fun and for exercise. Many doctors and athletes agree that swimming is one of the best workouts you can give your body, because it works almost on all of your major muscle groups at the same time.
Since you're floating in the water and not in contact with any hard surfaces, there's less pressure on your joints and bones. You're less likely to suffer injuries than with other sports.
There are many ways to push yourself and get better as a swimmer. If you're into speed, you can race the clock and see how long it takes you to do a certain number of laps. If you're into endurance, you can slow down and see how many laps you can do before you have to take a rest.
Many teenagers like swimming best. One of the students says, “The best part about swimming is when you beat your time. It doesn't even matter if you lose the race as long as you tried your best; you can walk away with a smile on your face. When you're in the water you forget that people may be watching and all you care about is getting to the other side of the pool and touching the wall. You can just let go and fly.”
游泳是世界流行的競技運動，有許多不同級別的游泳比賽，包括奧運會級別的。游泳也是一種自己就可以進行的簡單運動，可以遊着玩玩，也可以鍛鍊身體。 許多醫生和運動員認爲游泳是你可以給予自己身體的最好的鍛鍊之一，因爲它幾乎同時調動了你所有的主要肌肉羣。
由於你浮在水面上，不接觸任何堅硬的表面， 你的關節和骨骼受到比較小的壓力，比起其他運動，游泳受傷的可能性比較小。
有許多方法可以推動你成爲一個更好的游泳者。如果你想練速度，你可以用表計時，看你遊一定的圈數需用時多少。如果你想練耐力，你可以放慢速度，看在不得不休息前你可以遊多少圈。
游泳是許多青少年最喜歡的運動。一個學生說：“游泳最開心的時候是打破自己記錄的時候。是否贏得比賽根本不重要，只要你盡了最大的努力，你就可以笑着離開了。當你在水中時，你會忘記注視着你的人，你所關心的只是到達泳池的另一邊，碰到池壁。你可以不顧一切地飛翔。”