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Grab a pair of dumbbells and stand on right leg with left toe pointed out to the side, lightly touching the floor. Bend right arm, bringing dumbbell to just outside of shoulder, and extend left arm up, palm facing forward. Press right arm overhead and bend left elbow as left knee lifts up toward chest. You should feel your left obliques working to lift knee as high as possible. Return to start. Do 15 reps, and then repeat on opposite side.
Train for Flat Abs: Reverse Crunch. The reverse crunch targets the lower abs, which are tough to tone. Keep your arms at your sides, palms down. Use the abs to lift the legs, bringing the knees directly over the hips. Contract the abs further and raise your hips and lower back off the mat, knees toward your face. Hold briefly before lowering back to the mat. Don't let your feet touch the floor. Do three sets of 10-12 reps.