Crunches for 6 pack abs?Fact/ Myth?

What is the crunches workout all about?

Crunches are a type of exercise that primarily target the abdominal muscles, specifically the rectus abdominis muscle.

To perform a crunch:

1. Lie on your back with your knees bent and feet flat on the ground. You can either keep your arms at your sides or cross them over your chest.