The abdomen (less formally called the belly, stomach, or tummy), in vertebrates such as mammals, constitutes the part of the body between the thorax (chest) and pelvis.
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Reason for some variations in doing crunches or other ab exercises
In fitness classes I have often seen that crunches were done in a specific pattern, for example:
10 normal crunches
10 crunches in 2 steps (i.e. up hold 1 count, up hold 1 count, down, down)
10 mini ...
