For great ab and oblique exercises, try the Wood-Chop Crunch. The combination of ab exercises will really tighten and tone your stomach muscles. To start, lay flat on your back and bring your knees into a tabletop position. With dumbbells in each hand, bring your arms straight above you and open them into a chest fly. When your arms are back in the upright position, twist into an oblique crunch, really focusing on contracting your core. Come back to starting position and alternate sides after the chest fly. Perform two sets of 12 reps.
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