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How to go on a school field trip to the beach
The month before (if you know this much in advance), start working out a little.
Do 10-20 sit-ups per day , 30 jumping jacks or even a jog with your ipod or iphone or dog.
Eat healthy.
Fresh fruit and vegetables are the way to go, and check what's in season, like berries. If you know you are going to break this rule, eat semi-healthy things in small amounts such as dark chocolate (70%-80% cocoa) for a fix.