Crunches are workouts you need to do if you want prominent abs and core. It works the rectus abdominis muscle. The crunches are typically only a core working exercise and burn fewer calories relatively, but they move in a controlled way, flexing and releasing the core muscles thus promoting to build the abs. The many modifications of crunches have been developed to concentrate on different muscle groups in the identical area other than the rectus abdominis that is the only muscle focused on by normal crunches. Since crunches exercise is more controlled, it can help you increase your center on your exercise habit. And as it does not use any machine, you can do it anywhere. This exercise can also increase your muscle power and flexibility. Here are some types of crunches and how to do it. 1. The Basic Crunch The basic crunch is done by lying flat on…