People who are serious about their workout regimen place development of the abdomen at the top of their priorities–nothing like working on that coveted “six pack,” right? One of the best exercises for the rectus abdominus is called the Bike Crunch. This is not just our opinion, but has been found to be one of the top abdominal routines by researchers. Here\’s how the Bike Crunch works: Place a mat or something soft on the floor, then lie down flat on it, with the lower back against the ground. Your hands should be beside your head. Now bring the knees up to a 45 degree angle and slowly go through a motion as if pedaling a bike. Be sure to breathe evenly throughout the exercise. Do this for several minutes until you feel a good tension in the abdomen and legs. This exercise several advantages. This is a good choice to begin your abdomen workout, as it not only works this area, but gets the heart beating and oxygen flowing as well. Chief among them is its “portability.” That is, there is no equipment involved, and so, you can do it at any time, almost anywhere you happen to be–even at the office!