So a fightTIPS Underdog asked me for a full abs workout that he can do for his fight training. Here's one of the exact core workouts that I do to keep those six pack abs. Whether you're in boxing and want to take body punches, an athlete trying to improve balance and power, or just want that sculpted 6 packs, then you HAVE to do crunches. Whether you like it or not! It there was "one simple trick" to getting abs, then everyone would have them.