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As you're just walking around, mutter different words to yourself. If you have trouble, slow down and say them syllable by syllable, and just repeat until you can say it quickly. Do the same thing with phrases. Start simple at first. Practice "the cat sat on the mat (with a hat.)" It's very helpful in practicing to start speaking really fast. Again, you probably shouldn't mutter words to yourself in public settings with other people around; they might think you are possessed by a demon. However, if this isn't a problem, go right ahead.