Any ideas on workouts/exercises to get a flat stomach & burn fat without going on a crazy crash diet?

I used to have a really flat and strong stomach but over the years i’ve been putting on quite a bit of fat on my stomach. As a dancer I do need to have a strong stomach so I was wondering if anyone has any workouts or exercises etc that burn off fat and help my stomach area. Also any ideas on specific foods which are good and healthy to burn off fat would also be welcome. Thankyou.