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The main differences I've seen between the two: Crunches: Shorter range of motion, abs are more isolated, little to no lower back movement. Sit-ups: Longer range of motion (more time under tension), involves hip flexors, may involve rounding of the lumbar spine, easier to load with resistance. Of the two, I feel crunches are a better option as there may ...


More muscles are used in a sit up but crunches seem to focus on the abdominal muscles more. For myself I can do 2-3 times as many crunches, and always do some crunches after sit ups to continue working some of the muscles. The main group of muscles neglected in crunches seem to be the back and legs. In the military you get 2 minutes to do as many as ...

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