Crunches Sets & Reps Exercises

Learn How to Do Crunches: Mistakes Everyone Makes!

Follow these steps to Performing the basic crunch.

The basic crunch is the consummate abdominal exercise in a strength training program.

Crunches or abdominal crunches work the rectus abdominis muscle in the midsection of your body. Ab curls may also engage the external or internal oblique muscles, especially when rotation is added to the movement.