Unidirectional vs. Multidirectional Training

We live in a three (possibly four) dimensional world, yet most people exercise in a single plane. Think of running (or using an elliptical trainer), the gross movement is limited to one plane (the sagittal plane). I feel it is important to train the body through all planes of motion to most effectively train it. In fact one of my favorite sports, in addition to basketball and football, is Free Running. It is sort of a more extreme, freestyle way of going for a jog. Most people are not skilled enough or athletic enough to do these movements, but it looks so cool (in addition to an awesome, random workout). Someday, I will be half as awesome as Luci. Check her out in the video. How cool is that?