A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the text. It sets up the idea of starting a workout routine with clear goals. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'Next,' which shows it is not independent. Paragraph 3 starts with 'It's also crucial,' which refers back to something before. Paragraph 4 starts with 'Finally,' which also shows it is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the ideas in the text. It shows the final step in the fitness journey. The word 'Finally' indicates that this is the conclusion of the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of building a workout routine. The word 'Next' shows a logical order of steps in creating a routine.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it adds another important part of a workout plan. The phrase 'It's also crucial' shows that rest days are just as important as exercises.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it talks about the next step after rest days. The word 'Finally' shows that this is the last step in the process of staying fit.