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  1. Which Muscles Are Used When Doing Sit-Ups? | livestrong

  2. How to Do Sit-Ups: Techniques, Benefits, Variations - Verywell Fit

  3. Sit-Ups Benefits: Exercises, Variations, and More - Healthline

  4. Ultimate Sit-Up Guide: Strengthen Your Core & Hip Flexors

  5. How To Do Sit-Ups: Variations, Alternatives, Form and Techniques

  6. What Muscles Do Sit-ups Work? | ASFA

  7. Sit-Ups Muscles Worked: A Beginners Guide to Sit-Ups

  8. What Muscles Do Sit-Ups and Crunches Work? - Nike

  9. How to Do the Sit-Up - Men's Health

  10. How to Perform a Picture-Perfect Sit-Up for Stronger Abs

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