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|Noun||1.||tummy crunch - an exercise designed to strengthen the abdominal muscles|
exercise, exercising, physical exercise, physical exertion, workout - the activity of exerting your muscles in various ways to keep fit; "the doctor recommended regular exercise"; "he did some exercising"; "the physical exertion required by his work kept him fit"
sit-up - a stomach exercise in which a person sits up from a supine position without using the arms for leverage