Hello!
Answer: Yoga and Pilates.
Explanation: This paragraph states that while yoga and pilates are quite similar, they also have subtle differences. From this, you can infer that yoga and pilates will be compared in the rest of the passage.
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Well she said they had to keep there sound to a minimum
I would guess it would be the first one since rather than relying on just how she thinks it will be she actually goes out and tests it to be sure
you didnt include any picture or doc so i cant answer