Quizzes & Puzzles5 mins ago
abs exercises
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what is the difference between sit-ups and crunches?
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For more on marking an answer as the "Best Answer", please visit our FAQ.sit ups, done with the legs straight, are assisted by the muscles in the leg. It is for this reason that most people will now do crunches, with the legs bent and feet flat on the floor, as this isolates the abdominal muscles... so not only are they more effective at developing your actionman-esque six pack they are also less risky for your back and neck if you are prone to injury or are just starting out.