This 15-minute abs workout from Men’s Health Fitness Director B.J. Gaddour has a fun name, but it’ll cause your abs to burn and shake. The routine’s five movements hit every last muscle in your core, including your shoulders, obliques, rectus abdominis, hip flexors, and glutes. And since there’s very little rest, you’ll test your endurance and strength while burning a ton of belly fat at the same time.(For a workout program that will reveal your abs, try the Men’s Health 21-DAY METASHRED. One guy lost 25 pounds of fat in 6 weeks.) Directions: Do the following movements as a circuit, performing each one for 50 seconds. Rest 10 seconds between each move. That’s 1 round. Do 3 total rounds. 1. Plyometric single-leg hip thrust Watch the video above to see Gaddour perform each exercise with proper form.