Probably the simplest, and most popular, abdominal exercise is the crunch. Lying on the floor with your knees bent and feet flat will get your crunch started. Some people like to place their fingertips to the sides of the head, just behind the ears, while others like to do crunches with their arms crossed over their chest. Either way, the next step is to push your lower back to the floor and hold that while you crunch your abdominal muscles to lift your shoulders a few inches off the floor.
To mix things up a bit, you could add an exercise ball to your crunch. You will want to sit on the exercise ball with your feet flat on the floor. Slowly let the ball roll as you lie back until your thighs and torso are parallel with the floor. Then you will contract your abs, raising your torso no more than 45 degrees. The exercise ball is a lot of fun and can really help keep you from getting too bored with your usual abdominal exercises.
Whichever abdominal exercises you determine to be the best route to six pack city, don’t overdo it and end up having to postpone your trip. You should always check with your doctor before beginning a new exercise program and of course you can’t forget to stretch.