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Here are a handful of reasons why trainers, exercise scientists, and the US military all dislike traditional crunches and sit-ups, along with their recommendations for better core moves.
Lie on your back with knees bent at a 90-degree angle, keeping your feet flat on the floor. Place your fingertips on the back of your ears, elbows bent and pointing out to the side.
Learn about crunches versus sit-ups, including the muscles they work and how to perform them properly. Plus, why other core exercises are actually better. ... Plus, why other core exercises are ...
Major variants: reverse ~ (curling the pelvis towards the shoulders), twisting ~ or side ~ (lifting one shoulder at a time; emphasis is on the obliques), cable ~ (pulling down on a cable machine while kneeling), sit-up ~ (have [chest] touch your knees), vertical crunch (propping up to dangle legs and pulling knees to the [ chest] or keeping ...
Research has shown that both sit-ups and crunches are mediocre strength-building exercises and have injured many people. [3] In a crunch, unlike a sit-up, the lower back stays on the floor. This is said to eliminate any involvement by the hip flexors, and make the crunch an effective isolation exercise for the abdominals. [5]
Sit-up form. The sit-up is an abdominal endurance training exercise to strengthen, tighten and tone the abdominal muscles.It is similar to a curl-up (that target the rectus abdominis and also work the external and internal obliques), but sit-ups have a fuller range of motion and condition additional muscles.
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If the pelvis moves during the exercise then the hip flexors will also be dynamic prime movers. [1] A common exercise using the Roman chair for targeting the abdominal muscles is the "Roman chair sit-ups". It is an old-school exercise known to strengthen the belly. It can also strengthen some secondary stabilizer muscles in the core.