Start with this routine, which Wimberly created to target your entire core from different angles, to create your strongest, firmest, flattest center yet. (Join our Flat Belly Diet online community today to help you stay fit and slim.)

  1. Exercise Ball Roll-OutsWorks your entire core, challenges balance, and strengthens lower back Starting on your knees and sitting up tall, place a medium-size exercise ball under your hands while keeping your arms as straight as possible. As you roll the ball out, ensure you keep a straight body by not bending at the hips. Pull yourself back to starting position without bending your arms or hips, exhaling as your contract your center. Aim for 2 to 3 sets of 10 to 15 reps. MORE: 10 Moves That Resize Your Thighs
  2. Lower Leg Lifts With Exercise Ball Works your lower abs Placing an exercise ball between your legs while keeping a 90-degree bend in knees, squeeze the ball as firmly as you can. Engaging your pelvic floor as you squeeze the ball, lift your hips off the ground reaching the ball to the ceiling. (By attempting to engage your pelvic floor as you contract your core, you’ll engage more of the lower abdominal muscles throughout the exercise.) Gently lower hips back down. Repeat for 20 to 30 reps.
  3. High Back Extensions on Exercise Ball Engages your core, strengthens lower back, and increases balance Start by lying on top of your exercise ball, face down, your hips centered on the middle of the ball. Begin by squeezing your glutes. Then, lift your arms and torso as long and high as possible, still squeezing your glutes so as to not overly “crunch” into the lower back. Gently lower down and repeat for 10 to 15 reps, taking breaks as needed. Relax in Child’s Pose when finished to release the lower back. MORE: 10 Exercises You Hate The Most—And What To Do Instead
  4. Down-Low Back Extensions Engages your core, lower back, and upper back; improves posture Start by lying face down on the mat with the ball between your hands. Start by squeezing your glutes, then reach your arms and chest as long and as high as you can, keeping your feet on the floor. Make sure to keep your shoulders far away from your ears as you reach. Hold the lift for 2 to 3 seconds and gently lower back down. Repeat for 10 to 15 reps.
  5. Exercise Ball Passes Through Pike This advanced move targets your entire center Start with the ball between your hands as you lift straight legs and shoulders off the floor at the same time, pulling your belly button into your lower back. Keep your neck long and eyes to the ceiling. Bring your arms and legs together passing the ball through as you open back up. Keep your shoulders lifted and feet off the ground the entire time, and then repeat. Aim for 2 or 3 sets of 15 reps. MORE: Your 5-Minute Routine For Killer, Ageless Arms
  6. Twisting Side Plank Targets obliques and stabilizers Lie on your right side, making sure your right elbow is directly under your right shoulder as you get into your side plank as shown. Place your left hand behind your head. Keeping your body and hips high, exhale as you twist and lower your left elbow down to your right hand, and return to starting position. Aim for 30 reps on each side.