Cardio and strength straining exercises are both crucial if you want to get a flat stomach. Here's what personal trainers recommend.
How To Engage Your Core
The Best Cardio Workout to Get a Flat Stomach
Switch to these 5 exercises for flat abs and belly
Best Ab Workouts At Home: 20 Exercises for a Stronger Core - Men's Journal
The Best Stomach Exercises for a Tight, Flat, Toned Tummy
Ab Workout: 7 Ab Exercises to Tone and Flatten Stomach
24 Insane Ab Workouts That Will Give You A Flatter Belly In No Time! - TrimmedandToned
5 Stability Ball Exercises for a Crazy Strong Core
A 30-day workout to tone and strengthen your core