5. Improve your cardio workout
To achieve a flat stomach, you should get 3 60-minute high intensity workouts. Try running for 10 minutes, then go for a 1 minute sprint, do 5-10 burpees and 15-20 push-ups.
To get the best results you need to repeat this workout at least 5 times. However, begin with 1 set and then try to build your stamina to repeat it 5 times.