Crunches. It has been the centerpiece of many ab-focused workouts, due to both its simplicity and the intense burn and mind-muscle connection it produces. It involves the entire abs, but primarily it works the rectus abdominis muscle and also works the obliques.
Crunches can be part of a core strength workout or a total body workout.
It allows both building six-pack abs, and tightening the belly.
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Ab Workouts & Exercises: Upper Abs, Obliques & Lower Abs ...
The basic crunch is the consummate abdominal exercise in a strength-training program. Crunches are certainly considered as one of the most popular exercises to get strong and chiselled abs. Learn how to correctly do Crunch to target Abs, Hips with easy step-by-step expert video instruction.