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How: Start in a plank position and drive your knees toward your chest as fast as possible while maintaining a flat back.

How: Lie flat and lift your shoulders and legs slightly off the ground, forming a "banana" shape. Keep your abs tucked in tight. How: Start in a plank position and drive

Doing 10 minutes every day is more effective for core development than 60 minutes once a week. Doing 10 minutes every day is more effective

How: From a forearm plank, bring your right knee toward your right elbow, then switch. Goal: Combines static hold with active muscle contraction. How: Sit with knees bent and feet slightly off the floor

How: Sit with knees bent and feet slightly off the floor. Rotate your torso from side to side, touching the ground next to your hips. Goal: Targets the sides of the waist for a tapered look.

Goal: Builds the deep "inner" core strength necessary for visible definition.