A dietitian explains why smarter eating, not endless ab workouts, is the real key to revealing abs while preserving muscle ...

This workout uses nothing than a dumbbell, has just six moves, and takes less than half an hour to give your core a good burn ...

Step forward and slightly lateral with one leg, landing with your heel first. Work to avoid slamming your knee into the ground. Keep your chest in an upright position, bending your knees to form right ...