a piece of speech (may somebody tell me what's wrong?) :) thanks.

Along the Throughout history there have been a lot of kinds of many entertainment activities; today, I’m going to try to teach you one of them. one that This activity is very knowing well known especially because of circus shows, but not many people practice it. This speech is about how to juggle. well, This activity activity is not so difficult provided that you do that one practice frequently. I think this activity is very important for you because it can be useful for getting fun and for entertaining other people. Also, you can teach it to your family and friends.

Very good, Michael! You have very nice sentence structure and a good grasp of punctuation, like commas. Overall, there are not many errors to correct. There were a few words and phrases that can be replaced with more suitable options.