It's time to the give up crunches to do some ab exercises that really work. Skip lying on the ground and give this 10-minute ab workout a whirl. Adding a dumbbell to the workout makes it even more effective. Grab your weight, between five and 10 pounds, then press play, and get ready to work! Related: No Gym Needed With This At-Home Fitness Plan — All the Workouts Are Videos! Credits: On Anna: Adidas and APL shoes