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     Gymnastics is a really fun sport.Gymnastics is awesome because you can flip and go upside down all day!It is also fun because you can jump on a trampoline.One time I went to open gym and I bounced on the trampoline the whole time. Now, you see that gymnastics is a fantastic sport!

Main idea:Gymnastics is a really fun sport

Proof (1): Gymnastics is awesome because you can flip and go upside down all day!

Proof (2):It is also fun because you can jump on a trampoline.

Illustration (has a time word):One time I wet to open gym and I bounced on the trampoline the whole time.

Conclusion (say your main idea again in a different and more interesting way) :Now, you see that gymnastics is a fantastic sport!