are many people who think that dancing is a great way to get exercise and still have fun. Many dance teachers make videos you canto practice dancing in own home. Once you're learning the basics, much easier to learn more advanced moves.

“There” belongs at the beginning: “There are many people who think that dancing is a great way to get exercise and still have fun.” Here, “there are” introduces the existence of many people. “They’re” means “they are,” and “their” shows ownership, so neither fits this sentence.

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