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.
Sylvester StalloneIt took me a long time to be convinced that marriage was right for me because I've come from a long line of broken marriages. My parents divorced, and I had two broken marriages myself.
Sylvester Stallone