It is common knowledge that a muscular mid-section comes from proper diet, fat-stripping cardiovascular workouts, and abdominal exercises.

The cable crunch, when performed properly, combines the best of the basic crunch with weight resistance, and does so better than some more popular exercises, such as the machine crunch, which puts pressure on your hip flexor muscles.

As with any exercise, the cable crunch will lose it's effect if done too often. Rotate it with other exercises.