tummy crunch

English Thesaurus

1. an exercise designed to strengthen the abdominal muscles (noun.act)

hypernym	:	exercise, exercising, physical exercise, physical exertion, workout,
definition	:	the activity of exerting your muscles in various ways to keep fit (noun.act)

hyponym	:	sit-up,
definition	:	a stomach exercise in which a person sits up from a supine position without using the arms for leverage (noun.act)