stomach exercise(n = noun.act) tummy crunch - an exercise designed to strengthen the abdominal muscles;
is a kind of exercise, exercising, physical exercise, physical exertion, workout
has particulars: sit-up

aerobic exercise, anaerobic exercise, arm exercise, back exercise, cardiopulmonary exercise, commencement exercise, exercise, exercise bike, exercise device, exercise set, first stomach, fourth stomach, graduation exercise, gymanstic exercise, gymnastic exercise, isometric exercise, isotonic exercise, leg exercise, neck exercise, physical exercise, pit of the stomach, second stomach, setting-up exercise, stomach, stomach ache, stomach flu, stomach pump, stomach sweetbread, stomach upset, third stomach, turn one's stomach, upset stomach