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REPOST from @luviusthanh The vacuum exercise is an exercise which involves contracting some internal abdominal muscles, primarily the transverse abdominal muscle, and not as much the diaphragm. Repetitions of the exercise may be used as a form of endurance training, and light strength training. There is difficulty building strength in the muscle, as it is not easy to apply resistance training to the deeper internal muscles. The reasons for performing this exercise vary. It has been done for ...
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