Whats the best exersize to do when you want to lose stomach fat?

You cannot lose weight from a specific area of your body with any tactic/diet/exercise at all.

You burn more calories than you eat (by cutting down food, increasing exercise or both) and your body will begin using its fat stores from ALL OVER.

So, you'll begin losing fat from your stomach, but also everywhere else.

If you can jog, it is a good exercise to burn calories. Otherwise, anything! Weights are very, very effective too. Not only do you burn a lot of calories, you gain muscle, which burns more calories and looks good!

Basically what I would do is start jogging 2 miles a day. I know someone who lost 1 pound a day for 2 months straight after doing something like this. There are several other methods but I think that jogging/running and swimmer are the most efficient. Also, if you do not wish to cut down on food, you will need to increase your exercise to counter your carbohydrate and calorie intake.

Check this too:
http://www.wikihow.com/Lose-Weight

A REGULAR HEALTHY diet with plenty of variety, and REGULAR EXERCISE.

Get an exercise ball and do some crunches. That works very well because you do regular crunches and you can turn your body to the side to work out your obliques.

I think playing basketball becuase it is the most complete sport.

bike helps burn calories too and a balanced diet offcourse.