For killer abs, work your entire core including your often-forgotten lower back. A healthy, strong lower back keeps your spine stable so your abs can work harder, whether performing day-to-day tasks or a challenging exercise.
Back extensions are a simple lower-back exercise that can be done just about anywhere – on a machine, exercise ball, even on the floor.
Back Extension on Stability Ball
1. Drape your body over the ball and extend your legs into a wide
V and/or anchor your feet against a wall. Cross your arms in front of your chest.
2. Arch your spine, lifting your chest and contracting your abs; pause for a moment at the top of the movement. Return to start position and repeat.
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