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Reverse crunches work your oblique muscles and the rectus abdominis, the pair of muscles that run vertically down the core and are responsible for giving your core that “six-pack” look.
Abdominal muscles have many important functions, including breathing, coughing, and sneezing, and maintaining posture and speech in a number of species. [4] Other abdominal functions are that it helps "in the function of support, containment of viscera, and help in the process of expiration, defecation, urination, vomiting, and also at the time of childbirth."
Explosively sit up, bringing right knee toward chest, right arm back, and left arm forward at a 90-degree angles. Reverse the motion with control and repeat on the other side. That's 1 rep.
"Do not hollow your stomach or press your back against the floor", McGill says. Gently lift your head and shoulders, hold briefly and relax back down. [4] 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
Our core is made up of four muscle groups, and crunches target just one of those groups, so use crunches as part of a well-rounded core routine that works all abdominal muscles.
Extending the knee joint (often called a straight leg raise) [4] increases the demands of leverage on both hip and spine flexors. It also allows the rectus femoris muscle to contribute, for both the supine straight leg raise and the hanging straight leg raise versions, although the muscle will be in active insufficiency in the latter case.
Crunches offer abs and all-over benefits if you do them properly. Here are form tips, crunches modifications, and challenging variations to try from a trainer. ... For premium support please call ...
In this position, the extended arms are swung from one side to another in a twisting motion with or without weight. Equipment: body weight, kettlebell, medicine ball, or dumbbell. Major variants: back kept off the floor at 45° angle, back rested on exercise ball, feet resting on the floor, anchored or kept off the floor.