Authors: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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 Stallone