Sit-ups and crunches are used interchangeably sometimes, but these are two separate and distinct core exercises you do on the floor on your back. Here's how sit-ups are different from crunches, how to do each move correctly with good form, and their benefits for strength and fitness.
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The Difference Between Sit-Ups and Crunches—and How to Do Them Correctly
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How to Build Great Abs with the Sit Up
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BOXROX, Competitive Fitness Magazine
How to Build Great Abs with the Sit Up
Sit-Ups: Correct Way To Do, 8 Variations, Benefits