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Think of the ab crunch machine as the opposite of the back extension machine. While the back extension machine targets your lower back and core by bending backward, the ab crunch machine targets the ...

Want strong and sexy abs? Try a traditional ab crunch, says a new study from the University of Wisconsin-La Crosse. Researchers asked eight men and women between the ages of 18 and 24 to test out a ...

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Crunches are a classic core-strengthening exercise. Whether you're a frequent gym-goer or a fan of home workouts, there's a good chance you've already come across them before. Considering that ...