How do you get a six pack fast?
OK so, I have a flat belly and if i flex my stomach muscles i can see a four pack but otherwise it just looks flat. How do I get a six pack fast and does my four pack when i flex mean that i am already getting results from my crunches?

Yes, if your 4-pack is visible when you flex that means the crunches that you are doing are burning fat from over those muscles, therefore making them visible and paying off. I box, so I to do at least 200 bicycle crunches a day. Everyday. I guarantee you that if you do at least 200 crunches a day; you'll see results in no time. As you start, try 100 crunches then as your muscles get used to doing that repetitive motion, as the days progress you'll be able to do more. They will give you even quicker results towards your 6-pack goal.
sit ups
Go to the liquor store.
if i were you i'd try crunches and sit ups
To get six pack abs and lose stomach fat requires a careful balance between two things – Exercise and Nutrition.
You need to eat healthy to eliminate the layer of fat covering your abs and perform cardio, weightlifting and abdominal exercises.
For more info:
http://www.firmupyourabs.com