For many years, people have used tongue twisters of all shapes and sizes to improve their English pronunciation. Due to their repeated sounds, tongue twisters—despite their lack of sense—are incredibly beneficial in speech therapy. Actors, politicians, and even news anchors use them before going live because of this. In essence, a tongue twister functions similarly to a physical workout in that your pronunciation will improve with practice.
A tongue twister is defined as "a sentence or phrase that is intended to be difficult to say, especially when repeated quickly and often" by the Cambridge Dictionary. Take a look at this list of English tongue twisters if you'd like to work on your pronunciation as well.