How do you reduce tummy fat?

Do this: crunches (do them slowly and with perfect technique), 2 sets bicycles (while doing your crunch simply touch your left elbow to your right knee and then do the opposite), 2 sets Iron Man (lay down stomach facing down and get on toes and forearms and hold it there as long as u can) cocroach (sit on ground raise legs off the ground and arms and hold as long as possible) Answer: I'm man in 40's. I do 20 sit-ups daily. I lay on floor, arms at my sides. Slowly raise my upper body until sitting up, then lay back down. Repeat 10 times. Rest 1 or 2 minutes. Then the last 10 sit-ups. I've been doing this over 1 year. It helps to flatten my stomach, but don't have the popular six-pack-abs.