Hold a plank position, keeping your body straight and engaging your core to target the lower abdomen.
Perform a high-intensity exercise that involves bringing your knees to your chest in a plank position.
Lie on your back and lift your hips off the ground, bringing your knees towards your chest.
Lie on your back and lift your legs straight up, then slowly lower them without touching the ground.
Lie on your back and pedal your legs while bringing your opposite elbow to your knee.
Sit on the ground with your knees bent, lean back slightly, and twist your torso from side to side.
Lie on your back and alternate crossing your legs over each other in a scissor motion.