Try Our 5-Minute Abs On Fire Workout

This exercise is great for warming up. It gets the blood flowing, but as you raise the knee up, you're working your low abs.

• Hold your hands at waist level and bring the knee up to your hands as you run.
• Do this for 60 seconds (c'mon, you can do anything for a minute).

Roll-ups work the entire abdominal wall, but adding the leg lift focuses the work on your lower abs.

• Start lying on your back with your arms reaching toward the ceiling.
• Exhale and roll up toward sitting while lifting your left leg up. Pause at the top and reach for your toes before rolling slowly back down to the mat as you lower your leg. Then perform on the other side to complete one rep.
• Complete as many reps as you can with good form for one minute.

This is a full-body exercise, but your lower abs will be burning after 10 reps (along with your triceps).

• Start in a tabletop position with your back parallel to the floor and fingers pointing toward your toes. Inhale and lift your hips off of the ground so your torso is parallel with the floor and your arms are straight (bridge).
• Exhale to lower your hips and straighten out the legs, keeping your hips hovering above the floor as you come to the pike position. Make sure your pelvis moves behind your hands. Bend your knees and push yourself back into tabletop position. Keep the move smooth and controlled.
• Do 10 reps.