Imagine traveling without a destination. It can feel like you are moving through a forest where every tree seems similar to another. You walk slowly forward, looking around to see if you can find a point of direction, something to tell you where you are and if you are moving forward after all. Walking ever slowly in every direction to find awhile later, you are back where you started. You did not get far. The energy expended is equivalent to walking 7-10 miles, but in this case, getting nowhere.