If You're Wondering How to Get Flat Abs, Do These 20 Things

The most effective type of cardio that's proven to target belly fat is high-intensity interval training (HIIT). And no need to suffer for hours at the gym. "The whole workout, including warm-up, doesn't need to be more than 45 minutes to be effective," says fitness instructor John Kersbergen. He added that three to four times a week is enough.

Here are some HIIT workouts you can try:

• This 45-Minute HIIT Workout Will Help Shrink Your Belly
• Feel Your Strongest From This 45-Minute Flat-Belly Running and Strength Workout
• 30-Minute Cardio and Core Workout For Strong, Hot Abs
• This CrossFit HIIT Workout Is Just 12 Minutes, but You'll Be Toast Afterward
• 30-Minute Jumping Rope and Strength Training Mashup