Single-leg abdominal press
The single-leg abdominal press is another popular core exercise:
• Lie on your back with your knees bent (A). Keep your back in a neutral position, not arched and not pressed into the floor. Avoid tilting your hips. Tighten your abdominal muscles.
• Raise your right leg off the floor so that your knee and hip are bent at 90-degree angles. Rest your right hand on top of your right knee (B).
• Push your hand against your knee while using your abdominal muscles to pull your knee toward your hand. Keep your arm straight. Hold for three deep breaths.
• Return to the start position and repeat using your left hand and left knee.