What is a common mistake to avoid during an impromptu speech?

Wandering off-topic or rambling without a clear structure is a common mistake to avoid during an impromptu speech because it detracts from the focus and clarity of the message. A well-structured speech helps the audience follow the speaker’s ideas more easily, ensuring that the main points are communicated effectively. When a speaker does not adhere to a clear structure, it can lead to confusion and disengagement from the audience, making it difficult for them to grasp the intended message. By maintaining a clear path throughout the speech, the speaker can retain the audience's attention and deliver impactful content.