To get a six pack abs work out each section of abdominal muscles separately using crunchR.
There are 4 or 5 sections of front abdominal muscles (rectus abdominis). Compile a work out routine to exercise each abdominal section separately. Two crunchR exercises are the main part of such work out routine: crunchR legs lift for lower abs and crunchR upper body lift for mid and upper abdominal sections.
Use weights to adjust each set of abdominal exercises in your abbs workout routine. Do 4-5 sets of 7-8 reps for each section of abdominal muscles.
Check out the Exercise guide while developing you work out routine. For best results do your abbs work out routine 3 times a week.