For example, you can easily do traditional crunches with a well - supported head and neck, or you could do «push» exercises to work your arms and chest. (geekwrapped.com)
We also used ab exercises that work your core much more effectively then traditional crunches. (turbulencetrainingForAbs.com)
During traditional crunches your abs don't work as efficiently as possible, and sometimes, excess strain is placed on the neck. (ab-core-and-stomach-exercises.com)