A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of yoga. It gives a broad overview of what yoga is about without going into details. This follows the rule of Topic Sentence. Why other lines are not chosen? Paragraph 2 starts with 'Many embark', which is not independent because it uses a pronoun 'Many' that refers to people not mentioned before. Paragraph 3 starts with 'The initial challenges', which uses 'The', a definite article that assumes prior knowledge. Paragraph 4 starts with 'However', which is a conjunction and does not stand alone. Paragraph 5 starts with 'Over time', which is also a connector and does not stand alone.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about yoga. It shows the final benefits of practicing yoga over time. This follows the rule of Conclusive Words.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the topic of yoga. It shows how people start yoga for physical reasons but find more benefits. This follows the Logical Order rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it explains the challenges people face when starting yoga. It shows a cause and effect relationship where the initial challenges lead to frustration.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it talks about what happens after facing challenges. It shows how persistence can change frustration into growth. This follows the Cause and Effect Relationship rule.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it explains the long-term benefits of yoga after overcoming challenges. It shows a progression from personal growth to inner peace, following the Logical Order rule.