I have incorporated dragon flags slowly in my program for a couple of weeks after doing some reverse crunches. After reviewing my performance I think I would perform better by completely replacing reverse crunch with dragon flags for now.
So from this time on while doing Stronglifts 5×5 Beginner Program, I will be doing Dragon Flags instead of Reverse Crunches.
This is what a Reverse Crunch looks like:
This is what a Dragon Flag looks like: