Answer: Not stating the direct reason for their stance.
Explanation:
A thesis statement is one sentence that expresses the main idea of a research paper or essay, such as an expository essay or argumentative essay. It makes a claim, directly answering a question.
This thesis statement is too informal and vague. A better choice would be “Stretching is a vital step one must take before exercising, and here is why.” Or something along the lines of this.
