5. Dumbbell Swing
Hold a dumbbell with both hands at arm's length, bend at your hips and knees, and swing the dumbbell between your legs. Then thrust your hips forward and swing the dumbbell to chest level. That's 1 rep. Continue to swing back and forth.
6. Cross-Body Mountain Climber
Assume a pushup position with your arms straight. Lift your left foot off the floor and raise your left knee toward your right elbow. Return to the starting position and raise your right knee to your left elbow. That's 1 rep. Keep your hips level and don't pause during the motion. (Learn 4 more core-carving moves.)
