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For example, seated presses may be done while standing. In recent years, many home fitness enthusiasts have begun incorporating a swiss ball into their workouts in place of a traditional bench, since it is both more space-efficient and requires engagement of the core abdominal muscles. This substitution is not without criticism, since it can be ...
Weight machines use gravity as the primary source of resistance, and a combination of simple machines to convey that resistance, to the person using the machine. Each of the simple machines (pulley, lever, wheel, incline) changes the mechanical advantage of the overall machine relative to the weight.
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."
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