11 Core-Stability Exercises That Do More For Your Abs Than Crunches Ever Could

If you've mastered the side bridge, continue to challenge your core stability and strength with the side plank.

• Begin by lying on your left side with your legs extended and feet stacked. Bring your left elbow directly under your left shoulder.
• Engage your core, press your left elbow into the floor, and lift your hips off the floor to rise into a side elbow plank.
• If your balance feels off, stagger your top foot in front of your bottom foot.
• Try holding this position for 10 seconds, and work your way up to a minute or longer. Do two or three sets on each side.