(Image credit: Shutterstock) Forget Russian twists and sit-ups for a moment and try this three-move core workout with just a light set of dumbbells. With just these three moves and some spicy targets to hit, you can work your core harder and smarter in a short time. Your core muscles help stabilize your trunk and pelvis, so strengthening as many of them as possible is crucial for better balance, coordination, injury prevention and driving heavy weights. Always aim to engage your core by drawing your stomach toward your spine while bracing and directing your breath down and out. Here’s how to do this dumbbell abs workout step-by-step. Grab two of the best adjustable dumbbells , and read on. Watch: 3 moves, 4 rounds, rest 30-60 seconds between rounds: Round 1: 20 on 10 off Round 2: 30/ 15 Round 3: 40/15 Round 4: 50/10 Complete all moves for 20 seconds on with 10 seconds off between exercises. Enjoy 30-60 seconds rest, then move to the next round, and so on.…