There's more to core training than crunches. Try this anti-lateral flexion exercise.
- Lock your feet under the crossbar of a standard bench press.
- Extend your torso straight out with your hips "stacked."
- Holding a 10-pound plate to your chest, simply press the plate out in front of you until your arms are fully extended, and then return back to starting position.
- Perform 8-10 reps per side.
Building a Superhuman Core
The World's Toughest Core Exercise