The Best Core Exercises to Flatten Your Stomach Fast .

Hold your body in a straight line from head to heels, engaging your core to keep your body stable. This exercise strengthens the entire core, including the abs.

Sit with your knees bent and lean back slightly, holding a weight or medicine ball. Twist your torso from side to side, engaging your obliques to tone the sides of your waist.

Lie on your back and bring your opposite elbow toward your opposite knee while straightening the other leg. Alternate sides in a pedaling motion, targeting the abs and obliques.

Lie flat on your back with your legs straight. Lift your legs toward the ceiling while keeping them straight, then slowly lower them back down. This exercise works the lower abs.

Start in a plank position and alternate driving your knees toward your chest. This cardio-based core exercise helps burn fat while strengthening the core.

Lie on your back with your legs straight and arms under your hips. Alternate kicking your legs up and down in a fluttering motion to engage the lower abs and hip flexors.

Lie on your back with your arms extended toward the ceiling and knees bent at 90 degrees. Slowly extend your opposite arm and leg while keeping your core engaged, then return to the starting position.

Lie on your back with your legs straight and arms extended overhead. Simultaneously lift your legs and upper body off the floor, reaching for your toes, then return to the starting position. This targets the entire abdominal area.

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