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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 ...


1

These exercises are variations of the hollow body hold, which is quite a common exercise for gymnasts in order to perfect their handstand. As this an intense core exercise, it is always going to be especially hard to breath due to the abs being held in contraction. However, I personally do these types of exercises and find that quick forceful exhaling and ...


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You are likely hyper-extending your back. The best thing to do is to find a PT to work with you, but if you want to do it yourself, here is what I suggest: Start with the 'dead bug' exercise. When you do this, make sure you keep your lower back absolutely flat against the floor or bench. If you want to do leg lifts, you can only do the with your lower ...


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The best I can do is provide some general advice, since I'm missing detail and I'm not a physical therapist. If you have pain working your abdominals, it is typically unusual to have pain in your lower back. You'll want to make sure of the following things: Correct technique: a common problem is hyper-extending the lower back, which increases stress in ...



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