For a strong and defined core, incorporating targeted ab exercises into your workout routine is essential. 

Here are five effective ab exercises to help you build muscle and enhance core strength:

Hold a push-up position on your forearms, keeping your body straight. Engage your core and hold.

Sit with knees bent and lean back. Twist your torso, touching a weight to each side.

Lie on your back, lift your legs, and alternately bring elbows to opposite knees in a pedaling motion.

Hang from a bar and lift your legs straight up towards your chest, then lower them slowly.

Lie on a decline bench, curl your torso up towards your knees, and then lower back down.