I Tried Halle Berry's 5-Minute Ab Workout, and My Abs Still Haven't Forgiven Me

Grab an ab wheel, or a barbell with two rubber bumper plates, and complete 12 reps of the ab wheel rollout. You can also do this move with an exercise ball.

Next up, you've got a single-leg walkout push-up. Basically, it's a plank walkout with one leg elevated off the ground followed by a push-up. Complete 10 reps.

If that wasn't hard enough, give the partner plank shift a shot. It's a small movement that will leave your core shaking. If you don't have a partner, you can do a body saw. Complete 12 reps.

Next up is the hollow rock. If this is too hard, you can also do a v-sit. Hold for 30 seconds.

Are your abs trembling yet? Finish off your workout with partner leg taps. If you don't have a partner, you can do a lying leg raise with a hip thrust, double-leg lifts, or reverse crunches. Complete 12 reps.