Crunches are much more effective than regular sit-ups because they specifically target your upper abdominal muscles rather than your hip muscles. If you're not used to them, they can cause soreness a day or two later, but it's a 'cool' soreness. A badge of honor.
About This Quote
About Sylvester Stallone
Sylvester Stallone was a contemporary American actor and filmmaker. Sylvester Gardenzio Stallone is an American actor, painter and filmmaker. In a film career spanning more than fifty years, Stallone has received numerous accolades, including a Golden Globe Award and a Critics' Choice Award, as well as nominations for three Academy Awards and two BAFTA Awards. Read more on Wikipedia →