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Consider for a moment that a major job for your abs is not to pull your chest to your knees (crunch and sit up style), but to remain erect and not collapse like when doing a front squat: Crunches and sit ups don't have a large isometric component, as where something like front squats, deadlifts, and planks do. Most of what we want our backs to do in daily ...


3

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 ...


3

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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